LeftKnife is a mode that most often ends up with very short games.
I have found LeftKnife.tbm set on a server with 100 match frames, 100 turn frames multiple times.
If I see LeftKnife on a server, I will go in and look at who's playing. If it's any name I recognize, I'll be tempted to ban them for a minimum of 3 days.
Then I'll /set mod classic and be on my way.
Any further discussion of other mods or possible ways to end farming needs to be in a more appropriate topic.