diff --git a/librecomp/include/librecomp/helpers.hpp b/librecomp/include/librecomp/helpers.hpp
index d8f5afd..eb9f86f 100644
--- a/librecomp/include/librecomp/helpers.hpp
+++ b/librecomp/include/librecomp/helpers.hpp
@@ -7,8 +7,7 @@
 #include <ultramodern/ultra64.h>
 
 template<int index, typename T>
-T _arg(uint8_t* rdram, recomp_context* ctx) {
-    static_assert(index < 4, "Only args 0 through 3 supported");
+T _arg(uint8_t* rdram, recomp_context* ctx) requires(index < 4) {
     gpr raw_arg = (&ctx->r4)[index];
     if constexpr (std::is_same_v<T, float>) {
         if constexpr (index < 2) {
@@ -38,6 +37,25 @@ T _arg(uint8_t* rdram, recomp_context* ctx) {
     }
 }
 
+template<int index, typename T>
+T _arg(uint8_t* rdram, recomp_context* ctx) requires(index >= 4) {
+    const auto raw_arg = MEM_W(index * 4, ctx->r29);
+    if constexpr (std::is_pointer_v<T>) {
+        static_assert (!std::is_pointer_v<std::remove_pointer_t<T>>, "Double pointers not supported");
+        return TO_PTR(std::remove_pointer_t<T>, raw_arg);
+    }
+    else if constexpr (std::is_integral_v<T>) {
+        static_assert(sizeof(T) <= 4, "64-bit args not supported");
+        return static_cast<T>(raw_arg);
+    }
+    else {
+        // static_assert in else workaround
+        [] <bool flag = false>() {
+            static_assert(flag, "Unsupported type");
+        }();
+    }
+}
+
 inline float _arg_float_a1(uint8_t* rdram, recomp_context* ctx) {
     (void)rdram;
     union {
diff --git a/librecomp/src/mod_manifest.cpp b/librecomp/src/mod_manifest.cpp
index a75d253..a96bf2a 100644
--- a/librecomp/src/mod_manifest.cpp
+++ b/librecomp/src/mod_manifest.cpp
@@ -466,22 +466,20 @@ recomp::mods::ModOpenError parse_manifest_config_schema_option(const nlohmann::j
 
             auto precision = config_schema_json.find(config_schema_precision_key);
             if (precision != config_schema_json.end()) {
-                int64_t precision_int64;
-                if (get_to<int64_t>(*precision, precision_int64)) {
-                    option_number.precision = precision_int64;
-                }
-                else {
+                if (!precision->is_number()) {
                     error_param = config_schema_precision_key;
                     return recomp::mods::ModOpenError::IncorrectConfigSchemaType;
                 }
+                option_number.precision = precision->template get<int64_t>();
             }
 
             auto percent = config_schema_json.find(config_schema_percent_key);
             if (percent != config_schema_json.end()) {
-                if (!get_to<bool>(*percent, option_number.percent)) {
+                if (!percent->is_boolean()) {
                     error_param = config_schema_percent_key;
                     return recomp::mods::ModOpenError::IncorrectConfigSchemaType;
                 }
+                option_number.percent = percent->template get<bool>();
             }
 
             auto default_value = config_schema_json.find(config_schema_default_key);
diff --git a/ultramodern/include/ultramodern/ultramodern.hpp b/ultramodern/include/ultramodern/ultramodern.hpp
index 57db6f6..46aea61 100644
--- a/ultramodern/include/ultramodern/ultramodern.hpp
+++ b/ultramodern/include/ultramodern/ultramodern.hpp
@@ -96,7 +96,8 @@ enum class ThreadPriority {
 void set_native_thread_name(const std::string& name);
 void set_native_thread_priority(ThreadPriority pri);
 PTR(OSThread) this_thread();
-void set_main_thread();
+void set_entrypoint_thread();
+bool is_entrypoint_thread();
 bool is_game_thread();
 void submit_rsp_task(RDRAM_ARG PTR(OSTask) task);
 void send_si_message();
diff --git a/ultramodern/src/threads.cpp b/ultramodern/src/threads.cpp
index 812c556..6e3ed18 100644
--- a/ultramodern/src/threads.cpp
+++ b/ultramodern/src/threads.cpp
@@ -29,14 +29,18 @@ std::string ultramodern::threads::get_game_thread_name(const OSThread* t) {
 
 extern "C" void bootproc();
 
-thread_local bool is_main_thread = false;
+thread_local bool is_entrypoint_thread = false;
 // Whether this thread is part of the game (i.e. the start thread or one spawned by osCreateThread)
 thread_local bool is_game_thread = false;
 thread_local PTR(OSThread) thread_self = NULLPTR;
 
-void ultramodern::set_main_thread() {
+void ultramodern::set_entrypoint_thread() {
     ::is_game_thread = true;
-    is_main_thread = true;
+    ::is_entrypoint_thread = true;
+}
+
+bool ultramodern::is_entrypoint_thread() {
+    return ::is_entrypoint_thread;
 }
 
 bool ultramodern::is_game_thread() {
@@ -45,7 +49,7 @@ bool ultramodern::is_game_thread() {
 
 #if 0
 int main(int argc, char** argv) {
-    ultramodern::set_main_thread();
+    ultramodern::set_entrypoint_thread();
 
     bootproc();
 }
diff --git a/ultramodern/src/ultrainit.cpp b/ultramodern/src/ultrainit.cpp
index ca1556c..af5132c 100644
--- a/ultramodern/src/ultrainit.cpp
+++ b/ultramodern/src/ultrainit.cpp
@@ -22,7 +22,7 @@ void ultramodern::set_callbacks(
 }
 
 void ultramodern::preinit(RDRAM_ARG ultramodern::renderer::WindowHandle window_handle) {
-    ultramodern::set_main_thread();
+    ultramodern::set_entrypoint_thread();
     ultramodern::init_events(PASS_RDRAM window_handle);
     ultramodern::init_timers(PASS_RDRAM1);
     ultramodern::init_audio();