I’ve been trying to think of a way to remove the “mode select” in Fire Emblem 7 on FEBuilder but I don’t know how. I’m sorry if I shouldn’t ask a question like this in here, but I don’t know where else to ask for stuff like this. I’m kinda new here.
If you’re making a custom game (and not just editing fe7), you should hack fe8u instead. Most asm hacks (aka Patches) are made only for fe8.
Here are some links that may be somewhat relevant to fe7 hacking, but I am not sure if they actually answer your question completely: