Oh yeah, I was the multi-config king, at one point I think I had 12-15 different ones to boot up in. Falcon 3.0 was the toughest since you needed 621k for some features (I forget what now). QEMM did rock, I still have a floppy (a 5 1/4 no less!) of it in my "archive".
I still have an old 486DX4-100 with DOS 6.22 on it loaded up with all those old games, AOTP, AW 1.13g, Red Baron, Falcon 3.0, Strike Eagle 2, Gunship 2000, and Tornado just for nostalgia's sake.