I've added a rear perspective in a few cases where a wet stereo sampleset has too little reverb for my taste, for example, Stade and Little Waldingfield.
It's not too hard to set it up and then disable it if you don't like it. In General settings: Add a rear mixer group containing your rear stereo pair(s) as primary bus(es). Those rear primary buses get your choice of reverbs added to each rear bus in the mixer settings.
In Organ settings: In Rank voicing, select all ranks, send 50% (suggestion) of the signal to perspective 3, and set a short release truncation less than 100 ms on perspective 3. In Rank routing, set all ranks' perspective 3 to send to your rear group. Adjust the organ's wetness scalar to taste.