So you're talking about the viewfinder is too small to focus? It's really no problem, I shot some photos of the PMA with only manual focus lenses, now that was some hassle... I also have quite a few of the fast AiS primes as well, and I know the key to get accurate focusing is to first practice and know which way is to draw back to pull towards the focusing plane and then the second thing is to keep an eye out for the rangefinder confirmation dot on the bottom left.
I have these AiS lenses 28mm f2, 35mm f1.4, 50mm f1.2 and the 180 f2.8.