[App_rpt-users] Switch to CW ID upon key up

I was wondering if anyone has found a good clean way to cause the voice ID to switch to a CW when someone keys up on a system operating in a repeater configuration. This is something most hardware controllers do and its a function I would like to try to implement. I figured I would ask here before trying to re-invent the wheel. Ideally, it would switch to a CW ID when a local station would key into the system and also when a remote connection would key up as well.