My program (CSDS) can do asymmetric stuff, 2-couple stuff, 3-couple stuff, and of course illegal and fuzzy stuff. The program is not a definitions-based program, so it doesn't care if you do weird, asymmetric or illegal stuff.

I write about 90% of my material by pushing checkers. I use the computer primarily for proofreading sequences and adding getouts.

I strongly believe callers should write most of their material using checkers so that they understand the flow, how the call moves dancers, etc. Using checkers to write sequences instead of a computer dramatically improves your sight-calling skills since you understand how each call functions. Also, when pushing checkers, you can easily see where the call could be modified (with a replace or whatever). I primarily only use the computer to proofread the sequences, add resolves, archive material, and do frequency counts.