1. You can turn the clock off in the CFG file. Instructions are included as a comment in the file.
2. And while screen burn in (or LCD "persistence") is still an occasional problem, under normal circumstances it shouldn't be an issue with something like this. You need to leave the monitor on for very
extended periods of time with static screen elements in place for that to happen. I've only seen persistence occur (and that very rarely) on things like order entry kiosks, status boards, or other "ON-24/7" setups where the screen acts more as a control panel or entry keypad.
FWIW: I set my screensaver to come on in 15 minutes and my monitor to shut off after 30 in order avoid wasting electricity. So should most people. If you're getting screen burn from a screensaver on one of today's monitors, you're probably leaving it powered on way too long anyway. So save a few cents along with your monitor by taking advantage of available powersaver settings. It's good for your wallet - and good for our planet too!