I've been marking tracks in the car that I want to set a Wendy flag on; I have a saved search for marked tracks. So I want to go to that search, select all the tracks, set a Wendy flag, and clear the mark. I can do all but clear the mark. Is it deliberate?

You have to clear the mark one track at a time. It annoys me, too.

I think the reason is that a checkbox can only be on, off or disabled. The other fields seem to have a "differs between items" value, too.

IWBNI jEmplode checked to see if "marked" was either all-set or all-unset as special cases, and enable the checkbox for those.

Interestingly I had to write a JTriStateButton to do Wendy Filters ... Would be interesting to switch all checkboxes to tristates during a multiple select

You have to clear the mark one track at a time. It annoys me, too.

Create a playlist of marked tracks. Sit down with the player and the remote. unmark, ffwd, umark, ffwd....