When I first got a BP/W I realized immediately that I wanted a quick release mechanism AND an elastic component. I was ridiculed on the forum for my comments about an elastic crotch strap, but time has shown the idea to be robust and useful.
I take a 6-inch piece of heavy bungi material and tie a loop on the plate (at the rear attachment point).
I have a small barrel clip tied to the crotch strap, so I can instantly add or remove the crotch strap - should i decide not to dive with one. I then have an independent loop of belt on one section of the fastex clip and the other mate of the fastex clip on the main piece of strap. This allows it to be adjustable and gives you some stretch when you bend over on the boat for example.
I've bought several things from strapworks, they seem to be a good company. these are cool belts for wearing in casual settings and for camping uses etc..
Side Release Buckle Straps