May I suggest you are over thinking this?
It worked under Vista so the odds are pretty good it will work for you on Win 7.
Set a Restore point, install your softwasre and test. You will have your answers in 15 minutes.
I tried Shrew with Windows 7 32 bit. As soon as I installed Shrew my connection to the internet dropped. I disabled the Shrew services one at a time, the Shrew DNS service was the problem. So for me, it does not work and I am still looking for a solution.