I am 99% sure this forum software will NOT do this. It's a complaint I have had all along. There are two ways people can fix their posts but they don't take the time to learn how. One is with UBB code; the other is tinyurl.com. I've made several posts about this on this forum, it's one of my pet peeves, just drives me nuts.
The feature you speak of is a fairly recent forum software development, me thinks. A fantastic one, at that.
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Bill
SmallGig.com