You mean you should have one "Fix"-beta release and one "Experimental"-beta release, or? I think the general consensus is that when Arcen believe they have a stable enough release, they release it retail. That's the thing you are supposed to use if you aren't actively beta testing. It's supposed to be stable and bug free.
If you go into beta, you also have to endure the gimmicks of new mechanics and features, since that's what beta really is all about. Having two different releases isn't really feasible, I think...