Just thinking while playing a game, the enemy had one or two last star bases left (far from my shipyards) and it's such a pain to #1 build a ship and then fly him all the way over destroy the star bases and then have to fly him all the way back...
It would be cool if we could develop sort of a kamikaze type ship which you just send over and it slams into the target object causing lots of damage.
This would also be good for bombing planets, just to reduce their population.
It could be accomplised if ships had the ability to ram/crash into a target causing extra damage.