Why isn't there an option to follow the source file's sample rate? It should be there at least for the Open SL ES Hi-Res output.
For me, it's the whole reason I use Poweramp, NO RESAMPLING!
It's a PitA when you have 44.1, 48, 96 and 192kHz albums.
If you search you'll see this has already been addressed. Max (the dev) has said it would break a lot of other functionality - gapless, crossfade, etc - and create noise and possibly and extra delay during the switchover transition.