I think the most I've done was 7 mics and mono SBD, I'd call 5 of the mics a virtual coincident stereo array, and the other 2 spaced omni's. I experiment a lot and don't have a regular thing I do. The coincident is usually mid side, or dual mid side, or horizontal B array. MS additional channels may be options to compare later, like cardioid or shotgun mid, and/or mid omni that might be low passed for bass only. If I'm doing more than mono, but not more than 2 mics, it's usually MS. If I'm stealthing, it's usually mono with a 4060 omni, have never been happy with the motion effects of stereo in a stealth situation, though I may do it so as to pick the best of the two at various points. I haven't gone PAS all that many times though I recognize the value in many situations.