Free-roam roaches huh. No way I'd do it either, I'd be afraid to step on them. Requiem gets the full run of my desk sometimes because she can't climb so she's stuck on the desktop. The other two can't get out of their cage because the top snaps on. If you don't want them climbing the sides you can have two options, vasaline on the inside walls or put a little clear nail polish on the sticky pads of their feet, make sure it dries before setting them down or letting them lick their feet, and their feet can't stick the the walls but they can still climb clothing and your hands.