You have to lift the lever and then turn. I can't think of any situation where it would get knocked open.
I bought a hose, secured it to the nipple with a pipe clamp and feed it into the subframe. Never have to worry about where my hose is. Going on 3 years without an issue.
It actually does NOT sit much more in than the stock drain plug. I would wager pulling the valve after draining would just result in residual left over dripping out.