I've tried to simplify my GTD process so that I actually do the steps rather than fiddle with ways to keep track of doing the steps 
I read on one random GTD'ers site that he restricts his project list to only those he is actively committed to working on and able to work on in the next 2 months. This differs from the "Year or less" RULE. He does the normal GTD thing with the rest (defer, etc.).
Right now, I've got well over 20 projects (be careful what you wish for), but I don't honestly have time to work on them all, and some are much more important than others.
Would it be horrible if I changed my GTD project definition from 1 YEAR to Actively Committed to And Able To Work on in the Next 2 Months?

I read on one random GTD'ers site that he restricts his project list to only those he is actively committed to working on and able to work on in the next 2 months. This differs from the "Year or less" RULE. He does the normal GTD thing with the rest (defer, etc.).
Right now, I've got well over 20 projects (be careful what you wish for), but I don't honestly have time to work on them all, and some are much more important than others.
Would it be horrible if I changed my GTD project definition from 1 YEAR to Actively Committed to And Able To Work on in the Next 2 Months?