First of all thanks for this great extension!
The description says that edits appear as "bot", but in my case (MediaWiki 1.27.4, MassEditRegex 8.0.3 ca4642e) they only do if I'm logged in as a bot. If I'm logged in as admin, all edits appear under my usual username.
Besides it would be great if we had the possibility to mark all edits as "minor edits" (like you can do in Extension:ReplaceText).