My scrolling is set up like this:
-Playerbox.X - scrollx >= 12
--Set Scroll X to Playerbox.X - 12
-Playerbox.X - scrollx <= -12
--Set Scroll X to Playerbox.X + 12
edit: typo and forgot comparison with scrollx
This kind of scrolling has a dead area the center of the screen so the camera is not locked on to the player.
However occasionally (not too oftem) it jitters when going right, or left. Can't reproduce it on command. I added a Wait 0.001 seconds function but that doesn't do anything to alleviate the problem.