There is a time limit on how long a post can be edited after posting to discourage what you described from happening. For management reasons that time limit does not apply to moderators in their forum(s) or admins in any forum. So I may well be (probably are) the author of the edit you noted. (mea culpa)
What you are looking for could be a handy feature but AFIK it is not available in UBB. The only solution I can offer is personal, and that is to discipline myself to always post a new corrected message rather than editing or adding an addendum to an existing post and limit any edits to typos or coding errors.
