I think it would be neat to have a toggleable option (or rather, two distinct options, one for classes and one for recruitment) when randomizing Recruitment and Classes of playable characters (it could be done for enemies and bosses as well, but playable characters are the ones players would be most interested in I think) to force characters to change their classes and recruitment time, basically to prevent them from keeping the same class and/or join time as in vanilla FE8. I have no idea how hard it would be to implement.