I created an updated capex/fba2x rom list here. Seems like there is no wiki data on the compatibility list for FBA2X, but at least that link will narrow down the games list for you.
My update was for supportability, not compatibility. No-one, so far, has made an effort to update the compatibility for FBA2X that I can tell. The wiki sure could use it. You may want to check with Squidge or whoever maintains it now for what they may want released.
P.S. no gems recommendations; there are too many lists for that; you just need to cross reference them with what FBA supports and what you like to play to find that out.