I dont know, I have personally wanted more then a conquerors victory. What if there was a culture victory, or a relic victory, or a trade victory, or maybe even diplomacy?
ah, that certainly is a good idea. a diplomatic victory though seems most difficult with this game, as it appears to be much more geared to war than galciv or civ are (where you could win a game without ever declaring war, if lucky even without being attacked).
maybe there could be a victory such as in the traditional tbs games in that when you build a combination of stuff, or finish the research tree you automatically win. I think that even age of empires II had a world wonder win, but I am not quite sure anymore, if that was a dedicated game type.
another way would be different winning conditions for different races. I thought of this after having started to play that civ 4 mod rye's and fall of civilisations. for the vasari, maybe a certain amount of ressources could be a victory type, whereas the advent should ... oh well ... convert a certain percentage of their population to their faith, or reach some culture level. tec ... well maybe not losing a single planet for a certain period of time (remember the lore: the are largely fighting a defensive war). that way, it might be a bit funnier if different players try to go for different objectives. the big problem I see would be balance as each goal would easier or harder depending on the situation. on the other hand its also the player's to get himself in the right situation (also referred to as strategy). well, a point to discuss at the least I guess.