Yeah but someone above was talking about leaving that bottle ON while the reg was stowed alongside it.The reg position on a stage bottle vs a sidemount bottle is like 6 inches.
Shut it down unless its got to be on. If it has to be on (cause it feeds your BOV or whatever) then put a shut off on the stowed 2nd stage. The shut off is a bit of a kludge, moving the 2nd stage off the bottle someplace where you'll notice a leak is much better IMHO.