I committed some drycode this morning (I'm still allowed to! It's still alpha!) so I expect it's likely broken right now
Arawethion: I'll check out the error on the raid threat wipe.
To wipe a single mob:
/script AceLibrary("Threat-1.0"):WipeRaidThreatOnMob("exact mob name")
The mob name should be auto-localized by Threat, so no worries if you have people of another locale in the raid.
This actually wipes your target threat and sets a global threat offset so that future queries on that mob return targetThreat + globalThreat - globalThreatOffset. This makes it cleaner than doing a full raid threat wipe, because you don't want to wipe global (healing/gain) threat for all mobs when one mob does a raidwide threat clear.