Originally Posted by Airburst

OK, I understand what you mean. You don't need to use the chain tensioners if you're running a rear mech, because the cage and pulleys on the rear mech are sprung to keep the chain tight, even when the length of the chain changes as you shift gears. If you're still going to use the rear mech, you don't need the tensioners. The quick-release should be strong enough to hold the rear mech on, provided it's a good-quality one, I've seen a bike with a rear mech like that and quick-release wheels once before.