The main combo London server is still using cgzpp21a but I will switch it to 21b for xmas.
I changed the damagetype for combos to 'ShockCombo' as was done in ut2004 so I could easily detect combo kills for a combo whore announcer. I also thought about setting the damage type for the secondary fire, in fact, I did set it to 'ShockBall' in FNN but later suggested they change it back in case it would break compatibility with any mutator that relied on the jolted damage type. That would be cool though to show top combo ball killers etc 😉
Are you already referencing smartCTF for stats at all? I will soon be adding variables to smartCTF so that total combos and insane combos (aka holy shit combos) can be displayed on the scoreboard exactly as sp0ngeb0b did. It might then be best that you get that information from SmartCTF and then you will automatically be adding compatibility for the UrS server in case they ever decide to put it back online and decide they want to run node utstats 2.
By the way, the UrS combo weapon used damageType 'combo' for combo kills which adds yet another reason to just get the info from smartCTF.
Here is where sp0nge added the additional variables to the UrS specific smartCTF version: Combos & InsaneCombos
https://github.com/Sp0ngeb0b/SmartCTF/blob/master/Classes/SmartCTFPlayerReplicationInfo.uc
I will add those same two vars to SmartCTF for ESU combo servers and then the standalone insane combo mutator can just update SmartCTF whenever those type of kills are detected.