I've administered or moderated a number of small boards over the years and I've never seen one where a post couldn't be edited.
white_roses, Your position/responsibilities as I understand them are actually those of a Forum Moderator.
RWAdmin (if his user name is to be believed) is the Forum Administrator. Assuming he has administrative rights to the forums he should be able to grant you edit rights.
Barring that and assuming this whole conversation is going to be deleted Monday morning you could make a post in the thread saying why you're taking whatever action you're taking.