When using double-click + mouse modifier in the MIDI editor CC lane, the double-clicking automatically deselects all events before calling its linked Action. As a result, double-click + mouse modifier cannot be used to call any Action that depends on, or is supposed to manipulate, selected events.
EDIT: I have upgraded this bug report to a broader problem of double-click and click-drag mouse actions also running the single-click mouse action:
http://forum.cockos.com/showthread.php?p=1674246