Reaper Tracks corresponding with Reason instrument tracks

This is a biggie for anyone using Reason as a rewire slave because it allows each instrument within Reason to be monitored, controlled and rendered in Reaper, as opposed to Reason working essentially in a bubble with the master stereo output the only audio link to Reaper. Sonar and Ableton Live do it quite handily (Sonar at a level that could be termed "full integration"); and once you've had this feature, its absence seems almost like a bug. Oddly, Reaper does exactly what I'm asking in several other instances, like NI's Superior Drummer. Reaper currently only seems to support Reason's "master out" channels, which is useless because while Reason has 64-audio output capability, in practice only the first two are actually used. Attached pic definitely related.

You can do that already in REAPER. You just need to remove your mixer in REASON and route all your modules straight to the Hardware Device, then inside REAPER you load the plug-in (ReWire: Reason) and in Audio From ReWire tab you go routing all your channels (you need to set your track to as many inputs as you may need). You can create several tracks inside REAPER and make them receive audio from that track where the plug-in is inserted (you need to untick Master/Parent Send" in that track after routing).

Yep, there are 64 channels of audio coming from a rewire slave when you set the track to 64 channels in the I/O. Btw. is there a way around the 16 channels of MIDI barriere somehow?

Any advancement in this?

just set up a track template for your reason input

Here's the track template I use if you're interested.