those are actually good ideas. I had thought about the martial arts before, with a real fighting action, Street Fighter style
even if probably too hard for me to program.
However is not a bad idea, the problem I think is the fight itself, don't know if would be cool to watch like UBM is (apparently hehe).
For the gladiator there could be a combat system (with weapons, and special attacks) and you could fight with team vs team, making it a cool idea indeed. Yes, definitely will take it into consideration for future games