Hmm, I know the guy who wrote that. 
There is still no official way from within the platform to enable/disable apps/drivers by automated means, only manually checking the checkbox. (Could someone write an app that pretends to be a person checking the box, sort of like how Hubitat Package Manager pretends to be a user adding app or driver code? Probably. But I'd consider that pretty hack-y, too.) Given that the original intent of this feature was troubleshooting and not automation control, I'm not sure there ever will be. Can't speak for the platform devs, of course.
But @aaiyar basically mentioned above the workaround I mentioned there--just correctly mentioned that since Hubitat's Alexa integration (and maybe Alexa itself?) doesn't support garage doors natively, you'll have to use switches, locks, or some other thing it does support.
Personally, I'd do that with a Rule or something, a virtual/proxy device, and the unmodified MyQ integration. The alternative is modifying the MyQ app for mode restrictions, but unless you want to re-modify your fork every time a new version is released, sticking with this workaround would let you continue to use an unmodified version of that community app (unless you can convince the dev to add something like this, which they may or may not be willing to--I realize that was the original intent of your post, but since none of us can control that, I just figured I'd mention again something that is already possible today ).
