@Scraps hooking the bight is intentional and it certainly does prevent you from deploying the full length of the hose. Intentionally. When you are in a gas sharing situation, you don't need to deploy the full length instantly so it requires intentional motions to deploy the full length.
Clipping behind your chest strap can cause issues if you use a traditionally located canister light, but if it makes you feel better I'm not sure I'd really have any serious objections to it. I wouldn't do it, but it's mainly because I don't have any issues that would cause me to seek tha tsolution.