The intent of a bolt snap near the reg on the long hose is to allow you to clip the reg off to the right shoulder D ring when you are using a stage or deco reg.
A bolt snap on the hose near the waist belt seems to me like an impediment to speedy deployment of the long hose in an emergency. If you do it, use an o-ring passing it trhough the eye of the bolt snap and then run the hose through the two looks that are created. It will provide some drag to keep the snap in place but more importantly it will break away with a sharp tug you will not have to have to mess with unclipping the bolt snap with an OOA diver on the reg end of the hose.
Better yet (and simpler) just tuck the excess hose under your waist strap if you do not have a can light with you. It will just pull free when you need to deploy the hose.
As an aside, with the bolt snap near the reg, I attach it using a large o-ring (about 1/8" by 1.25".) Loop it through the eye of the snap, then run ne loopp through the other and stretch the remaining loop over the mouthpiece and slide it down to the base of the mouthpiece. It will stay secured when clipped and will also pull free of the o-ring in needed real bad with no need to unclip the bolt snap - which will stay clipped to your d-ring.