What I wouldn't mind seeing is accuracy. Number of shots that hit enemy minus number of shots that hit teammates all divided by total shots fired. Two separate accuracy scores, one for aliens one for humans. Shots hitting buildables count in the accuracy for the buildable's respective team. I think this will cause more md/lasgun and less spray'n'pray. Pounce and trample and crush wouldn't count, of course. Splash would count as half a hit. Flamer wouldn't be counted either.
Yeah.
Also, if it's score/time, it should be time spawned, not just time on the team. I usually stay on my team even if we have no spawns, speccing the survivors.
On the subject of unpowered buildings, I think they should slowly lose health until they explode instead of just randomly exploding later on, starting a minute after they lose power. That way the aliens don't get as many points anyways unless they attack them quick, and the humans have time to move RC without base exploding.
[offtopic]
On another note, buildings should heal 1/120 of their max health every second while powered. That's from 1 to full in 2 minutes.
Also, DC should raise tesla range and/or turret range/spinup.
Also, tesla should have tapering damage ranges. Basically the closer you are the more deadly it is.
[/offtopic]
In general, I loved everything about Tremstats. And FYI, people can still get their efficiency by using kills/deaths/buildable kills per type :p