its a great idea. i wouldnt use one.
according to Pope and Young
1. The following shall not be considered a hunting bow:
a) A crossbow.
b) Any device with a gun-type stock or incorporating any device or mechanism that holds the bowstring at partial or full draw without the shooter?s muscle power.
**** c) Electronic or battery-powered devices shall not be attached to a hunting bow.
d) No portion of the bow?s riser (handle) or any track, trough, channel or other device that attaches directly to the bow?s riser shall contact, support, and/or guide the arrow from a point rearward of the bow?s brace height.
I tend to stick with what Pope and Young says.
Mathews Z7
CX Maxima Hunter 350
Sure Loc Single pin
Grim Reaper Broadheads