On Wavelab pro 12, would it be possible to mute/unmute a clip or a set of clips with a right-click/mute or right-click/unmute?
Rather than using the Clips tab and checking the corresponding boxes in the “Mute” column
You can already do that. You have to be aware, that you get a different context menu for a clip, depending on where you do a right-mouse-click, check the manual. In your case, you want to click in the upper half of the clip, above the envelope.