MC Channel processing as lists (rotation, displacement, etc)

Im trying to rotate or displace the values of the channels of a mc.sig~(or any mc object for that matter) something like an offset, but of course it might be expanded to interlace, and locate, etc. Mainly, it would be nice to be able to process the channels as a list, like with the zl objects. This is my solution, but some ideas on how to do better will be greatly appreciated. Thanks.