1512's have dual ports in for angle blades, so with the splitter, you can do both separately. Same with a QL dual stick if you put another valve inline.The other year I added a two spool valve with rear ports to a 782. Can’t seem to locate pictures but it was pretty easy. Basically remove hoses going to the front port at the valve. Put a hydraulic tee in and reconnect hoses. The rear hoses go into the open side of the tee.
xtrememotorworsells a kit to add.
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Key point is it will only operate one set of ports at a time (front or rear).