Feature Request: Customizable separator between hydra prefix and head

[snowman]

(defhydra h/zoomh ()
  ("v" text-scale-decrease "out"))

(defhydra h/vi ()
  ("h" backward-char))

Would generate

• h/zoomh/body
• h/zoomh/v
• h/vi/body
• h/vi/h

So when M-x h/v, I want to match hydra prefix first, but it would both match the head h/zoomh/v, and the prefix h/vi

Expected

With customize separator(like hypen -) so above commands would become:

• h/zoomh-body
• h/zoomh-v
• h/vi-body
• h/vi-h

So M-x h/v would ONLY match prefix h/vi, would not match head h/zoomh-v