Problem with the detonate mines default ability binding.

Everyone has the ability to detonate mines that you hotkey. Using this hotkey prevents putting detonate mines into one of your skill slots but I don't think it's working fully, at least not like how other skills work.

If you hold the hotkey down, it doesn't repeat like abilities in your skill slots. If you put detonate mines into the skill slots, you can hold it down for repeat casting. It feels clunky using the built in hotkey and I can't help but feel it's meant to be repeating while you hold the key down.

Is this intended, or a bug possibly?