Define Visible Screen Area?

for my needs (projector, 2:35.1 screen) i found dsplayer’s “define visible screen area” option very useful, but now that i no longer need dsplayer, and have uninstalled it, this option no longer exists… so is there a way to just add some code directly to an estuary xml file(s) in order to achieve the same results? to be clear, i don’t need to see or have the options in the gui settings, all i really need is to know where i can add some code that will produce the same results…. i played around with the estuary home.xml file but couldn’t get it to work… fwiw i had the dspalyer “define visible screen area” option set to 0 for left/right and 180 for top/bottom… thanks in advance!