bahahaha! yea donkey ones!!
I'm learning maxscript and developing a little toolbox for Corona which started out as just region render (see attached) and had an IR button and now I have a "IR VBF" and "IR VP" setup thanks to this new function.
Trouble is I've no way to access the viewports to stop the IR docked version. Same really for the IR VBF type too.
Seems this is not also accessible via MXS. Once any of those IR types are fired up, maxscript is non-applicable at that point and can't be stopped, unless manually.