I've thought of Julio Franco more than once while I've been putting this together

The only real weirdness I've seen is a guy pitching a few innings at the age of 56. I mean, it's not going to be perfect, but I think it's better than default. In fact, provided they don't put up MVP numbers... I think having a straggler or two adds to the character and realism of the game. And based on what I've seen, even with these mods, the chances of an MVP season after 33 or 34 is *highly* remote.
The batting curve for 12262 is done, and it's even better than the one from 12260! (At least, mathematically speaking). I'm just waiting on one final test to check the pitching.