I setup my exchange account and it enforces a password. Now everytime my screen turns off, i have to type in a password. this is quite annoying. Is there anyway to make it so that I only have to type the password if it hasn't been touched for like 15 minutes or something like that? This way if the screen just dims for a few minutes, I don't need to type the password but if I haven't touched it for some amount of time (e.g. 15 min) then i have to type the password.