I figured out a way to control faders and pan pots in Reaper with my Yamaha DM1000 (uni-directional, not bi-directional!). It might work with an 02R, too.
Read chapter 11 of the 02R user manual (MIDI remote) and try to configure it to control an XG device (or Pro Tools).
In Reaper, you have to activate the appropriate MIDI input device (enabling controllers, too). Once everything is configured to have a working data connection (this will be only one way, not bi-directional, with the 02R sending fader or pan data to Reaper) you have to assign actions to control Reaper faders or pan pots via the 02R. Watch out for actions like "Track: Set track volume for Track xx (MIDI CC/OSC only)" or "Track: Set track volume for selected Tracks (MIDI CC/OSC only)". When you click the assign button to assign a key to the desired fader action in Reaper, move the desired fader on the 02R and Reaper should then assign the fader to that action.
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