Yes, I have the same issue as well. I could just use doors but it is true, you have the players ask... "so which one is the actual door?" Then again you can use the windows and then go to the lighting layer as Rick stated, that is also what I do for now. But I think the option would be nice to just have a Curtains option or something so when you click that, the players still see it as a window icon and not a door. Takes away any confusion in the matter. I have seen several people post about this issue, I think it just needs some +1s to actually push it through.