[Least favorite GBA game]

I finished FE7 and went "Wow, this game was so cool! Time to play FE6" and man, that game was full of "THAT'S BS!!!" moments. Downloaded FEBuilder, made some changes and I can safely say I'm having a blast so far. 

[How to add a playable Tactician to Lyn mode?]

I managed to add Eliwood to Lyn's first chapter just fine, but whenever I try to add Mark he just doesn't appear. Also, I managed to add Mark to Eliwood Mode, but for some reason he can make an infinite number of actions on Player Turn. Any idea of how to solve this? I just want to add Mark to the game, sounds simple enough.