Adding a race selection could be cood like for example you can be a ghoul (immune to rads), mantis, radscorpion (with poisonous attacks) a centaur (with rad and poisonous attacks)... a mutie ;-)
Say you have to change the starting default HP and HP/level depending on the race for example muties could start with 150/180 hp and gain 2XEN per level but could not wear armors...?
Could be fun.