After experimenting with it, my finding is "no", for the following reasons:
Number the pins 1 through 4, with 1 being on the side with the key and slot. Pin 1 is ground and pin 2 is Vcc. Resistors from pin 3 to ground set the voltage, and resistors from pin 4 to ground set the current limit.
Voltage values open 14.87 V 100k 15.11 10k 17.38 5k 19.7 100 device permanently destroyed Current values (measured with voltage open) value current open unlimited 100k 3.08 A 10k 0.71 A 100 too low to measureI apparently blew some component in the voltage regulation path by connecting a 100 ohm resistor (it started running again after being power cycled, but the voltage would never go above 14.8), I tried to open it to see if it was easily fixed. It is obviously not intended to ever be opened or serviced. I had to break the case open destructively, and then peel off many layers of glued-down shielding. By the time I was able to access the components, it was obvious that the brick was never going back together, and I didn't bother even looking for the fault.
Don't feel bad - I got it for free from the trash.