Yeah, most people around here make Match stages. I mean, Single-Player works too, but not many people make those either, sadly.
All that really changes is that you have to use team starts, and that there will be a "Blue Base" sector and a "Red Base" sector, with the corresponding flags in each.
Suggestion: keep the flags on the correct side of the stage. I played a UT2K4 stage where the opposing teams started off with their opponent's flags, and... it sucked. I mean, maybe it could be done properly, but that one sure failed at doing that.