You could use the sliding pocket door and not tell anyone, I don't think they'll ever know.
In fact I've thought for a while that the door and window tools could be merged into a single "Openings" Tool. I've always been able to make either behave as I need them to.
I ACTUALLY DID END UP USING THE POCKET DOORS INSTEAD OF WINDOWS, BUT WHAT IF I NEEDED (2) SLIDING DOORS INTO ONE SIDE POCKET? IS THERE A SETTING TO DO DOUBLE POCKET DOORS ON EACH SIDE?