I can't help but remember the Imperium Galactica II event like this;
A Sun is about to go supernova, and a desperate but pathetic alien race contacts you, asking for aid.
As the "Good" Humans, you can naturally send transports ships to aid the survivors and as a reward you get a handy tech and some increased population. Plus the joy of knowing you did something good.
As the evil conquering race, the same event plays out for you, but your choices are different. The game assumes you would never send transport ships, as culturaly this would be impossible to you. Instead, you get to choose to send some troops down for some last minute target practice. "This will give their deaths some meaning!!". You actually get some bonus out of it, I can't remember what, I was too busy laughing at the 'well meaning' Sub-officer who encouraged me to 'aid' them by hastening their death in combat.
I'd like to see events that trigger based on alignment, that are written specifically to that. Evil Ruthless Empires should get special events, where all three choices are fairly ruthless. I would love to assist in this area. I've all these wonderful ideas about how you can tell a story in the game with the events. I am just an abysmal programmer.
I'd also like to see that once you reach a certain alignment, normal events only allow the neutral and evil choice. You can't expect kindness so easily, once your culture and officers reach a certain level of ruthlessness. To even it out, all events could optionally have an extra choice that replaces the good choice with an evil one.
Naturally, you'd need to invert this for a Truly Good player. Once you reach a level of Goody-Goody, the choice to "Great, more slaves for me." should actually be gone, and/or replaced with one even more goody-goody than the good choice. "Welcome them with open arms!"