A few things I really hope will be eventually included in 0 A.D.:
make adding, renaming, or removing damage types as easy as changing resources; hack/pierce/crush is currently hard-coded; if one were to make a fantasy mod, he'd probably want to have different damage types, e.g. fire, ice, lightning, poison, etc.
have a generic armour, which applies to all damage types, unless otherwise specified
display gatherer counts ( https://trac.wildfiregames.com/ticket/643 )
automatically display attack multipliers (cf. auras) and remove the need to manually specify bonus attacks in tooltip strings
I guess these features have been requested before, but it doesn't hurt asking again