my only concern is that I get blacklisted by people weekly for not accepting every undo request or not caring that I take a while on complex hands.
I don't want to get reported for more than what I am doing. I fear the report thing could be abused.
Don't worry. People are free to blacklist you, if they don't like you denying undos.
But that is not a reason to get banned - and nobody gets banned just for the number of blacklist appearances.