Ive played on another server that had a mod i enjoyed a lot. There were random votes that would come up asking if you would like to have a knife round. There are 1v1 and gank round options. I dont have a link for the mod but that is the best way i could describe it.
hmm.....was it CMG's servers? If so, I've come upon this as well, and it's pretty cool. The 1 v 1 gives everyone a green beacon and once you're in a knife fight with someone, both those beacons turn red, and if someone tries to gank either person they get slayed. Your health returns to 100 after each knife kill. the gank rounds are just normal knife rounds... both pretty fun
Sounds pretty legit and definitely would spark some random fun in the middle of games...and give me more chances to poke Ouch and my other server minions!