Let me understand this. If you demand that your valve be not checked (??????), and it is closed as you leave the boat with a resulting quick descent, you are the only one effected? Let's see, someone has to find and drag your self centered butt up off the bottom, all divers are recalled so you can be transported to the appropriate medical services, hhmmmmmmm, not buying that no one else will be effected. Unless of course your sooo cool in an unplanned event and have awesome flexibility to reach over and turn your valve on coupled with the ability to clear your ears at an ascent rate of maybe 100ft/min. Maybe you could shoot a video of this skill, which of course has been planned so reaction time is greatly reduced. I'm one for awarding you an honorary PITA diver certification which may limit your diving options if displayed too proudly. I dive my recreational rig infrequently enough to be paranoid about whether or not I do have my valve open and ask the DM to check it for I leave the boat, a down side to Tech certs and experience is that DMs usually steer clear regardless of which configuration you may be diving. Recommendation if it's only a valve check would be to say thanks. I'm big on valve checking and have prevented many mishaps by those who have been ready to jump in, valve closed.