Behringer also has control surfaces which allow motorized sliders/knobs for quite inexpensive outlay. The Zoom R series should allow for independent inputs - quite a bit different than using an analog mixer to mix everything down to two tracks.

I'm a fan of Zoom products in general, my Zoom G5 is a killer guitar amp/effects simulator, and not a bad 2 track I/O device.

Whether or not the Zoom motorized faders can be controlled by BIAB/RB is likely not the case. This likely requires Mackie Control functionality of the DAW, and last time I checked this is not part of the function of PG products. Here's an old wishlist topic on the matter:
http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=85978

It's hard to see if the R series faders are in fact motorized. They may not be. If they are not, then it really isn't so much of a control surface as say the Behringer BCF2000 http://www.sweetwater.com/store/detail/BCF2000/ which absolutely has motorized faders.

To the OP, you may want to consider separating the function of what you are looking for - which is more important to you - multiple inputs to simultaneously record, control surface capability (which may eliminate PG products for you), etc. ?

-Scott

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