I think you are right; It does have loop length by beats as far as I can tell (Idon't have one , but for some reason I never saw the menu that has that on it when I was testing it.) If so, my bad, and if I can delete my posts on the topic I will do it.
I use 3/4 preetty much exclusively, and was very, very frustrated when I couldn't find a way to do it on the Force, whn I could do it easily on every other controller I own, Maschine, Push, Fire, MPC Live - no issues with any of them, including MPC 2.0 software. At the time, it didn't make sense that one couldn't transfer triple meter midi and audio back and forth between these DAW/s.
I remember being so frustrated because the Force seemed in every other way exactly what I wanted - a standalone clip launcher where I could program clips in desktop MPC and transfer them easily to Force.
Maybe I'll jump in and try it again. I love Ableton, but the Push 3 standalone isn't as portable as I"d hoped. Still, I have been with Ableton a long, long time, from the very beginning, so I'll keep it on principle.