This is different than a hair trigger. A hair trigger means you don't need to use a full trigger pull for the gun to fire.
A match trigger fires as fast as you can pull the trigger. I miss these, as they were in Borderlands (Jakobs) and CoD (Gewehr & SVT-40).
Let's introduce a 'match trigger' scout rifle Bungie!
EDIT: The B-line Trauma has a high ROF, but is not a match trigger. There is a ROF cap on it.
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Would only be balanced with low aim assist/high recoil... But I don't like the ROF limit.