HTC Incredible :: Prevent Sleep During Call / Make Phone Lock Automatically (like An App)?

Usually the phone is awake, and when you lower it the phone lights up for numeric input (love that feature).

But after a minute or so it locks. You have to push power button before you can enter numbers- annoying. Is there a "keep alive" option I'm not seeing?

On a similar note, is there a way to make the phone lock automatically (like an app)? It's also annoying to have to manually lock it: I'd rather keep waking it up (if it was indeed idle and not running a program) than forget to lock it and dial/message everyone in my contact list from my pocket.