What can we do with LUA? I can come up with ideas, and you can tell us it is possible or not.
Tbh, I'm fine with s1's KR system and I don't play on beg2, but here's a list:
1) Killing bots and dying by bots shouldn't affect KR. So you can't boost your KR.
2) Different weapons should affect the KR different way. It's harder to kill someone with a pistol than an arty.
3) Killing someone who has low hp should affect the KR different way than killing someone who has full hp.
4) Different classes or different teams should have their own KR (or PRW). Someone is better at defending, someone kills less as an engi etc.
5) The !shuffle command should use PRW or /score too. For example, 4*PRW+KR=usefulness or something like that.