Oh and:

4) Eliminator mode should have a fully-customisable weapon selection. For two main reasons: a) quakes sometimes feel like a cheap multi-kill, especially on a full grid, so they could be disabled, and b) it would be an interesting change to use just one or two weapons.

Many deathmatch-style games have custom weapon options (e.g. Unreal Tournament - rockets only! etc), and I think it would work very well in Eliminator too. Cannons-only would be very cool, for instance. Or just mines and bombs!

Interestingly, if you look at the icons in an Eliminator lobby, one of them cycles through the weapons available (1/8, 2/8, etc) in exactly the same way that the track icon cycles through selected tracks in a Tournament lobby. Perhaps this was already considered by SL but left out at the last minute? That weapon icon is fairly redundant at the moment...