Using the stereo matrices for mono purposes

How do you guys go about using the stereo matrices for a sub or a cluster or the likes. To me an obvious setup would be to leave the stereo out for maybe a simple lineout recording (without the geq) And use one matrix for L/R, one for sub, one for cluster and a stereo for fills, anyway these are the requirements usually in theaters where my sq5 is mostly used. Curious how you do this…

Great product, this sq 5 (coming from 01v96…)

can matrix out be mono? it would make much more sense then…