Originally Posted by gofer
But I'd also like to copy or erase CC on the active channel only - I'm aware that it's a completely different editing paradigm as in the rest of Reaper - that's why I still promote the idea to keep an "All channels" option for this whole thing available.
I think of it as very similar to how tracks in the MIDI editor can be set as active, editable, visible or invisible:
* With the "All channels" option switched on, the non-active channels are set to editable, so CCs from all channels can be selected, copied or erased together, for example.
* With "All channels" switched off, non-active channels are visible but not editable, so they cannot be selected and are not changed by editing.
EDIT: And with the Filter checkbox engaged, the non-active channels are set to invisible.