Not positive, but I think he is talking about triggering all the windows off the one switch. I suppose the way to test fuse blowing would be to hold all four buttons at the same time and see what happens.
Other than the obvious potential fuse blowing, it should be fairly easy to set up a relay to do this. There must be a wire that goes hot during the auto down process that is not hot when doing the manual controlled down method.
There might even be a specific relay somewhere for the autodown that can be tapped. Only problem I'm having is figuring out an easy way to trigger one window or all the windows by choice without adding a new switch, which would make the whole thing so clunky as to not be worth the trouble.