I will say this, I think the Disc+2 option is the best solution. My main reason for this is that the disc launcher is synonymous with Tribes. I have never been without it, in any setting in any Tribes game to date. Also due to it being non hitscan and primarily skill based it shouldn't be overpowering, it should just be in there because it's a Tribes game.
Maybe I'm not the best judge because I haven't actually played Tribes in awhile, but I've been watching the PAX footage and some T1/T2c videos side by side and I don't know guys, further tweaking to the physics is going to put it awfully close, maybe some faster energy regen or more in general, etc. And for all we know alot of the what we see as crappy skiing could just be crappy map design.