diff --git a/src/imports/avs.h b/src/imports/avs.h
index 77ff0ce..48024f9 100644
--- a/src/imports/avs.h
+++ b/src/imports/avs.h
@@ -36,7 +36,8 @@ enum property_type {
     PROPERTY_TYPE_S64 = 8,
     PROPERTY_TYPE_U64 = 9,
     PROPERTY_TYPE_BIN = 10,
-    PROPERTY_TYPE_STR = 11
+    PROPERTY_TYPE_STR = 11,
+    PROPERTY_TYPE_BOOL = 52
 };
 
 struct property;
@@ -57,8 +58,6 @@ enum psmap_type {
     PSMAP_TYPE_S64 = 8,
     PSMAP_TYPE_U64 = 9,
     PSMAP_TYPE_STR = 10,
-    /* Used on avs 803 instead of value 10 */
-    PSMAP_TYPE_STR_LEGACY = 11,
     PSMAP_TYPE_ATTR = 45,
     PSMAP_TYPE_BOOL = 50,
 };
diff --git a/src/main/jbhook1/avs-boot.c b/src/main/jbhook1/avs-boot.c
index 7084f70..969fbd8 100644
--- a/src/main/jbhook1/avs-boot.c
+++ b/src/main/jbhook1/avs-boot.c
@@ -77,7 +77,7 @@ static void avs_boot_replace_property_str(
         property_node_remove(tmp);
     }
 
-    tmp = property_node_create(NULL, node, PSMAP_TYPE_STR_LEGACY, name, val);
+    tmp = property_node_create(NULL, node, PROPERTY_TYPE_STR, name, val);
 
     if (tmp) {
         property_node_datasize(tmp);
diff --git a/src/main/launcher/ea3-config.c b/src/main/launcher/ea3-config.c
index 650e1bc..684ba46 100644
--- a/src/main/launcher/ea3-config.c
+++ b/src/main/launcher/ea3-config.c
@@ -160,3 +160,31 @@ void ea3_ident_to_property(
 
     property_psmap_export(ea3_config, NULL, ident, ea3_ident_psmap);
 }
+
+void ea3_ident_replace_property_bool(
+    struct property_node *node, const char *name, uint8_t val)
+{
+    struct property_node *tmp;
+
+    tmp = property_search(NULL, node, name);
+
+    if (tmp) {
+        property_node_remove(tmp);
+    }
+
+    property_node_create(NULL, node, PROPERTY_TYPE_BOOL, name, val);
+}
+
+void ea3_ident_replace_property_str(
+    struct property_node *node, const char *name, const char *val)
+{
+    struct property_node *tmp;
+
+    tmp = property_search(NULL, node, name);
+
+    if (tmp) {
+        property_node_remove(tmp);
+    }
+
+    tmp = property_node_create(NULL, node, PROPERTY_TYPE_STR, name, val);
+}
diff --git a/src/main/launcher/ea3-config.h b/src/main/launcher/ea3-config.h
index ccc2835..ada4400 100644
--- a/src/main/launcher/ea3-config.h
+++ b/src/main/launcher/ea3-config.h
@@ -38,5 +38,9 @@ bool ea3_ident_invoke_module_init(
     struct property_node *app_config);
 void ea3_ident_to_property(
     const struct ea3_ident *ident, struct property *ea3_config);
+void ea3_ident_replace_property_bool(
+    struct property_node *node, const char *name, uint8_t val);
+void ea3_ident_replace_property_str(
+    struct property_node *node, const char *name, const char *val);
 
 #endif
diff --git a/src/main/launcher/main.c b/src/main/launcher/main.c
index 4424381..ce04b89 100644
--- a/src/main/launcher/main.c
+++ b/src/main/launcher/main.c
@@ -94,7 +94,8 @@ static AVS_LOG_WRITER(log_callback, chars, nchars, ctx)
     free(utf16);
 }
 
-static void load_hook_dlls(struct array* hook_dlls) {
+static void load_hook_dlls(struct array *hook_dlls)
+{
     const char *hook_dll;
 
     for (size_t i = 0; i < hook_dlls->nitems; i++) {
@@ -283,6 +284,24 @@ int main(int argc, const char **argv)
 
     ea3_ident_to_property(&ea3, ea3_config);
 
+    if (options.override_urlslash_enabled) {
+        log_info("Overriding url_slash to: %d", options.override_urlslash);
+
+        ea3_ident_replace_property_bool(
+            ea3_config_root,
+            "/network/url_slash",
+            options.override_urlslash);
+    }
+
+    if (options.override_service_enabled) {
+        log_info("Overriding service url to: %s", options.override_service);
+
+        ea3_ident_replace_property_str(
+            ea3_config_root,
+            "/network/services",
+            options.override_service);
+    }
+
     /* Start up e-Amusement client */
 
     ea3_boot(ea3_config_root);
diff --git a/src/main/launcher/options.c b/src/main/launcher/options.c
index 91be9c0..995aedb 100644
--- a/src/main/launcher/options.c
+++ b/src/main/launcher/options.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "imports/avs.h"
 
@@ -135,6 +136,35 @@ bool options_read_cmdline(struct options *options, int argc, const char **argv)
 
                     break;
 
+                case 'S':
+                    if (i + 1 >= argc) {
+                        return false;
+                    }
+
+                    options->override_service_enabled = true;
+                    options->override_service = argv[++i];
+
+                    break;
+
+                case 'U':
+                    if (i + 1 >= argc) {
+                        return false;
+                    }
+
+                    options->override_urlslash_enabled = true;
+
+                    const char * urlslash_value = argv[++i];
+
+                    options->override_urlslash = false;
+                    if (_stricmp(urlslash_value, "1") == 0) {
+                        options->override_urlslash = true;
+                    }
+                    if (_stricmp(urlslash_value, "true") == 0) {
+                        options->override_urlslash = true;
+                    }
+
+                    break;
+
                 case 'D':
                     options->remote_debugger = true;
 
@@ -179,6 +209,8 @@ void options_print_usage(void)
 #endif
         "       -P [pcbid]      Specify PCBID (default: use ea3 config)\n"
         "       -R [pcbid]      Specify Soft ID (default: use ea3 config)\n"
+        "       -S [url]        Specify service url (default: use ea3 config)\n"
+        "       -U [0/1]        Specify url_slash (default: use ea3 config)\n"
         "       -K [filename]   Load hook DLL (can be specified multiple "
         "times)\n"
         "       -B [filename]   Load pre-hook DLL loaded before avs boot "
diff --git a/src/main/launcher/options.h b/src/main/launcher/options.h
index b7f0c01..cefcaf4 100644
--- a/src/main/launcher/options.h
+++ b/src/main/launcher/options.h
@@ -19,6 +19,10 @@ struct options {
     struct array hook_dlls;
     struct array before_hook_dlls;
     bool remote_debugger;
+    bool override_service_enabled;
+    const char *override_service;
+    bool override_urlslash_enabled;
+    bool override_urlslash;
 };
 
 void options_init(struct options *options);