EASY
First create a trigger, call it "KillTrigger" without the quotes, make it activated by anyone and select repeatedly
Then create a script called "setdammage.sqs"
_SelectNo = 0
#top
?( Far == 1 ):exit
_Lista = list KillTrigger
_UnitCount = count _Lista
?(_UnitCount<1):GOTO "top"
;this will tell you what everything is doing, just take it out when you happly
hint format["_UnitCount = %1,\n_SelectNo = %2,\nUnitToKill = %3",_UnitCount,_SelectNo,UnitToKill]
?(_SelectNo > _UnitCount):_SelectNo = 0
UnitToKill = _Lista select _SelectNo
UnitToKill setDammage (getdammage UnitToKill) + 0.1
_SelectNo = _SelectNo + 1
~(1 / _UnitCount)
goto "top"
In whatever you want to start this script put the command line (this exec "setdammage.sqs") without the brackets, BUT DON'T PUT IT IN "KILL TRIGGER"
This script defiantly works in 1.92 I've tested it myself
If you need anymore help just send me a message