from all that I can gather, the R-Strap is designed as a street shooter or photojournalistic tool. Rapid fire stuff. The only photo on the R-Strap web site that shows a tripod is one in which the photog has a long telephoto with the tripod in a lens support mount and the R-Strap in the camera base.
The only way this device could be designed for tripod use would be for the base of the R-Strap connector to have a hole bored in it to accept a tripod mount plate. The only firm contact between the camera and tripod would then be the base of the R-Strap. Not very steady.
They could develop a strap mount that was a tripod plate. The strap could connect to something like the D ring that locks the plate to the camera, but with the D ring large and connected to the sides of the plate rather that the center. Then it could fold back out of the way when the camera is placed on the tripod. Like this.I think I just invented something.
Dale