If you only turn on the nonstop and intro skip feature, is it allowed to use the usamune rom? I know this belongs in the CE forum but I tried it there and no one answered me, so I'm here now

usamune is a romhack, so no, only vanilla.

damn, it's so annoying to use single gameshark codes on ED64Plus

Actually https://imgur.com/s1Vf8VA

it is allowed.

Thank you