How about giving this a try that will find all the combinations, give enabled and disabled for the combinations as well as "Other" in case it is not one of the two combinations you want. Hope it helps:
UserSettings
| rex field=_raw "\[UserSettings\]\s*Player\s*\:\s*(?<playerName>[\S]+)\s*QC\s*\:\s*(?<qcCount>[\S]+)\s*QCAudio\s*\:\s*(?<qcAudioCount>[\S]+)
| eval qcenabled=case( qcCount=1 AND qcAudioCount=1, "Enabled", qcCount=0 AND qcAudioCount=0,"Disabled", 1=1, "Other")
| stats count by qcCount, qcAudioCount, qcenabled
I have added some extra \s* in the above rex just to be safe in case there are some spaces here and there but that rex can compactly be written like below as well:
| rex field=_raw "\[UserSettings\]\s*Player\:(?<playerName>[\S]+)\s*QC\:(?<qcCount>[\S]+)\s*QCAudio\:(?<qcAudioCount>[\S]+)
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