MMM,
It was partly a cost decision, this setup cost me around $300.00. To add a new spool valve, I would have to buy the Power Beyond kit ($210.00), a spool valve($150.00), twice as much hose, fittings and quick connects($150.00+) plus more real estate on the tractor to locate the spool valve.
I feel the advantage is that all the hardware and additional plumbing is on the loader itself, where it will be used rather than running lines from the rear to the front of the tractor.
Alot of switching? For a grapple I would put a momentary switch right on the joystick to operate the grapple(or blade angle) as suggested in a previous post, with a 3rd spool you would have to remove your hand from the from the joystick to the extra spool lever then back to the joystick when using the grapple.
That seems like much more effort than pushing a switch /forums/images/graemlins/wink.gif