Thats the same as RTF now. DM maps are uploaded as RTF and you can respawn. The only differences you said is checkpoint instead of nothing so you dont start from the beginning.
players: some will say yes and some will say no. Who to choose? You don't know and sometimes we (Goldberg and I) have to take decisions that some players won't like.
wallride is 99% of the time (when I tested maps) is hard for 75%+ of the players online. Only 1-5 players can do it out of 35+ players. I can't allow that to happen.
Forget to mention, I do like DM maps myself. I am the admin who started accepting DM maps as RTF in the first place (warp never accepted DM maps) and most players seemed that time to be fine with it, but now they are not and I can't accept them anymore (we have enough already).