diff --git a/runtime/include/mod_plugins.h b/runtime/include/mod_plugins.h
index 390891a9..2cdb6ee8 100644
--- a/runtime/include/mod_plugins.h
+++ b/runtime/include/mod_plugins.h
@@ -34,6 +34,12 @@ uint16_t psx_mod_read_half(uint32_t address);
 void psx_mod_write_half(uint32_t address, uint16_t value);
 uint32_t psx_mod_read_word(uint32_t address);
 void psx_mod_write_word(uint32_t address, uint32_t value);
+/*
+ * Replace one guest instruction and route that address through the runtime's
+ * executable-RAM path. Use this instead of psx_mod_write_word for code so a
+ * restored save state cannot leave the compiled instruction stale.
+ */
+void psx_mod_write_code_word(uint32_t address, uint32_t value);
 
 /*
  * Allocate opt-in enhancement memory from Expansion 1. Until the first
diff --git a/runtime/src/main.cpp b/runtime/src/main.cpp
index 81e04830..6c6ba82c 100644
--- a/runtime/src/main.cpp
+++ b/runtime/src/main.cpp
@@ -6007,7 +6007,13 @@ int main(int argc, char** argv) {
             }
 #endif
             {
-                int rui_deadzone_pct = seed.deadzone * 100 / 32767;
+                /*
+                 * Round to the nearest launcher percent. Truncation turned a
+                 * saved 20% value (6553/32767) into 19%, which the launcher's
+                 * 5% normalization then silently reduced to 15%.
+                 */
+                int rui_deadzone_pct =
+                    (seed.deadzone * 100 + 32767 / 2) / 32767;
                 ls.deadzone[0] = rui_deadzone_pct;
                 ls.deadzone[1] = rui_deadzone_pct;
             }
diff --git a/runtime/src/mod_runtime.cpp b/runtime/src/mod_runtime.cpp
index acfaf51d..d2d9e607 100644
--- a/runtime/src/mod_runtime.cpp
+++ b/runtime/src/mod_runtime.cpp
@@ -1124,6 +1124,11 @@ extern "C" void psx_mod_write_word(uint32_t address, uint32_t value) {
     psx_write_word(address, value);
 }
 
+extern "C" void psx_mod_write_code_word(uint32_t address, uint32_t value) {
+    psx_write_word(address, value);
+    dirty_ram_mark_executable_range(address & 0x1FFFFFFFu, 4u);
+}
+
 extern "C" uint32_t psx_mod_alloc_guest_memory(uint32_t size,
                                                 uint32_t alignment) {
     return psx_mod_memory_alloc(size, alignment);