Myself, I've pretty much given up on slings, although on occassion I do use a carry strap for hunting.
I walk in too much thick stuff. I have enough trouble just keeping my hat on my head, without a sling hanging up.
One of the guys at moose camp has a really nice setup he uses that might interest you. It allows the rifle to be slung in front of him, and easily alows him to swing his gun up to the shooting position.
Unfortunately, I don't know the name, perhaps someone will chime in here.