It would be nice to be able to set a symbol action to add or remove a mouse action. It would also be nice to have a symbol action to add or remove a mouse action (or another way to disable/enable touch dynamically).
Thanks for the suggestions!
I think the best you could do at the moment is move a transparent rectangle over the element with mouse actions to disable all mouse interaction. If you don't need to target IE < 10 you could also set pointer-events to none using javascript.