I notice that the supply can also provide +5VDC @ 2A.
Have you thought about putting a USB connector on the board to provide power for things like a Raspberry Pi?
Yeah, when I was initially designing this I was doing it for my own purposes and was thinking it would be silly to power the Pi off the same supply since if the power went out then you wouldn't have a way to know since the Pi would loose power too. Sort of realized after the fact though that there were a lot of different ways people would use these and probably should have put a 5th pin on the header for 5v power and offered a USB socket add-on board you could pop on the header.
If you have a soldering iron you can actually mod the board to add a USB power socket w/o too much trouble.
I found the pinout, so I'll probably mod this to add a USB +5VDC connection because not only am I using one of these to power my S1 but the design of your board is so nice and the power supply so good, that I will be using one as a bench test power supply and having a good +5VDC supply to keep small MP3 players charged, or a phone charged, will be handy.
I do car stereo work and sometimes you have to bench test things but amps require a minimum of 30A when they get up into the higher power range. Accessories that use USB (like the little Sansa MP3 player I use) need 5V to at least keep the batteries charged, so tapping into those pins will be good.