Something like this might work:

Step 1: Action 1: Fire the channeled ability
Step 1: Action 2: use a Mapped Key Step Action to manually set the current mapped key to step 2

Step 2: No action, do not advance for next x seconds

Step 3: whatever you want to do on the next key press


I have not tried this. It's just an idea from what I saw in ISBoxer.

Alge