Simple configurable Matrix panner

Please can I put in a request for a simple, reconfigurable, matrix panner for mapping multi-channel track outputs to smaller channel-count tracks.

For instance, when working with Poly-WAV files from a location sound job, there’s a need to map individual tracks or track pairs without having to split the poly-wav file to mono.

A matrix panner that allows me to easily map channels 3,4 from the poly wav to a stereo track channels 1,2 would be invaluable.