"How about if we all just try to follow these very simple rules of the road? Drive like the person ahead on the bike is your son/daughter. Ride like the cars are ambulances carrying your loved ones to the emergency room. This should cover everything, unless you are a complete sociopath."
David Desautels, in a letter to velonews.com
Random babblings and some stuff to look at.
I had the same problem on my Trek MTB. I'm heavy, so bumpy rides would make the seat slide down. However, if I tightened the nut enough to where it wouldn't slip at all, I couldn't close it without stepping on it. Then I couldn't open it by myself.
BUT, my qr has an Allen nut on the other side, so I just crank the quick release lever to hand tight, and then tighten the nut just enough with my multitool. It sucks having to use the allen wrench when I want to lower the seat to descend, but that's better than it slipping down slowly or suddenly during a ride!
I have to step on the quick releases on my wheels, too. My hands are just not that strong.
Karen