My apologies, I had thought that by 22x3, you had meant you wanted multiple starts. In that case I would agree with the above post to switch the machine to metric and type the thread data. When you say that the trapezoid form is giving you problems, what kind of issues are you experiencing? I understand from my experience machining that Acme threads are tricky and require playing with the offsets and number of passes a bit more than other more standard thread types, but the procedure for writing a conversational program would still be similar.
As a side note, after making the comment that PathPilot does not support multi-start threads, a co-worker showed me this work-around we discovered that I wanted to share for anyone paying attention to this thread: Multi-Start Thread cutting in Conversational - Lathe - Tormach Forums