Personally, I think low gravity would ruin deathrun. There's a very fine line between being able to trick the Ts into using a trap and being agile enough to dodge it. If you want to make deathrun more exciting I suggest a killswitch that kills all the CTs within a specific time span if they're not progressing fast enough in the map (sort of like the green mist that spawns in Iceworld after a certain amount of time has passed); this way they'll be forced to move quickly or die trying.

On the subject of course maps, I honestly don't think people care about the points. People usually tend to enjoy maps they are good at. Since a lot of people suck at course maps (like, really, REALLY suck) they are usually against voting for or even playing in them. I've also noticed that mg server players usually prefer gun based mini games, so being on a map were the only real action is jumping and dodging can be seen as idiotic by them.

and uh....yeah, that's my opinion on that.