Change midi channel with expression maps?

I usst want to underline the need to change (at least) the Channel via Expressionmap.
You should convince the Cubase-developpers aswell, that this would be an essential addition to the whole Concept of expression maps in a Sequencer to. Or any other way to change the samplesource (+VSTplugin) for the same voice. With every new Orchestralibrary or sampled single instrument the need of such an additions grows.