[req] Sort by: First Post Edit Time?

[PK8]

Hey, copypasting my request from MyBB.com.
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Hey there! I saw a feature like this in another site and found it to be a pretty cool feature. Kind of useful for anyone who shares some creative works and whatnot.

I don't really have the know-how to do this sort of thing, so I was wondering if it's possible to pull off making a plugin which adds an option to sort by "first post edit time" to certain pages such as forumdisplay.