Not only that, I could help people (regardless of what platform they map on) get their maps to work all version of Unreal and UT. I can't promise 100% that if people map on UT they can get their map in 227's editor without rebuilding, but in theroy it should be very possible to do. Believe me, I'd know (getting 7 bullets to half work in 227 WITHOUT rebuilding).
That's certainly noble of you Rabbit, though it would be prudent for all mappers involved to make room for this themselves at the outset. It doesn't take much to do this right if our limitations are tight. Depending on what dependencies/content agreement we vote on...well frankly, there's no excuse as to why any map shouldn't be configured with this in mind. If stock is the way we go then any version woes should be minimal, if they exist at all.
EDIT: Also, another issue that needs to be addressed is 'MyLevel'ing.
If we do all vote toward a stock content option I think this issue will resolve itself.
Also, just to be clear on my stance on the RTNP music, it is simply to keep it relative to Unreal stock material, which I feel is the best idea for this. The simpler the parameters the better. It's not because I think using RTNP is a bad idea or that I'm opposed to the tracks being used.