My TTT Karma suggestion is that Traitors should get boosted karma if they eliminate the Innocents and Detectives within a certain amount of time, for instance; say the time is one minute, and the Traitors elimate the entire opposing side. They will get a boosted amount of karma, but if they fail to eliminate the opposing side in under a minute, their karma will be regular. This is to discourage Traitors from waiting until late game to make their actions.
A friend passed this idea on to me, and i decided to put it on the forums. His steam link is: https://steamcommunity.com/id/armanmanarma