You have a pretty good place to put a "hidden" minimize hotspot on the top left of the menu screens, where the clock/date is. The only place you can't put a hidden button area is in a location where scrolling text is.
I put a hotspot over the clock in my skin on the top right, where my volume level is displayed.
arggg I hate those hidden buttons, I didnt know half of the stuff blue devil had because they were all hidden! Only when I went to modify the skin did I find them
Hehehe if you would have had a look at the help file, they are listed in there (With screen captures showing the hotspots). the 2 main ones being on the main menu's Top left of screen to lock Road Runner, and the top right to Minimize it.