You'll save your regulator and your ego by simply tying a boltsnap onto the long hose, near the regulator. Then, whenever your primary reg isn't in your (or your donee's) mouth, clip it off to your right chest D-ring.
No falling. No dropping. No draging. (and no laughter and embarrassment, or damage)
I do have a bolt snap, lol.. honestly I can't remember the last time I actually drug it around. I just figured the mental image would be good for a laugh. There was definitely a time when it was probably comical.
The reality is (for me) when I get back on a boat or out of a quarry I have to wrap it up and clip it off. My life just seems easier if this is already done. I actually use a bolt snap with some bungee so I can wrap it up and clip it off to the d ring... not my idea, found somewhere on this board.
edit: To clarify, it's hard without pictures, but I take the long hose off of myself and wrap it up and clip it off. So when I do go to "get out" of my kit all I need to do is remove the necklace and undo the drysuit inflator. This could be an issue with deco bottles clipped, but we're talking rec dives....right?