I think any mode can become a "farm mode" given it has the right settings.
I am not sure of the current settings of leftknife on the servers, but if is set in a way to where most matches end in one or two turns, then it probably is :x
I think they used to have leftknife with like, KB settings or something where the engage distance was actually pretty far, which was actually pretty fun, and the matches took a bit longer, but yea...