That’s definitely not the case. All of my other quantizers (and it sounds like @a773’s as well) let you choose both scale and root note. That way you can leave your VCOs tuned at 0V = C, and use the quantizer to change what notes you’re playing without re-tuning everything every key change. Perhaps one of us is misreading what the other is saying? 
To put this more concretely: there is no setting on Pam’s that lets me output the set of voltages {1/12, 2/12, 4/12, 6/12, 8/12, 9/12, 11/12} (plus or minus integer voltages, e.g. 2+(1/12)), because the root note for Pam’s is always 0V, and in the set I want to use 0V isn’t allowed. However, my other quantizers all would let me choose “A Major”, which would quantize to exactly that set of voltages (because taking 0V = C, that set of voltages I listed is C#, D, E, F#, G#, A, B)