You can swap it - then you also need to swap the reverse polarity diode as it is only rated for 1A.
Might be easier to just get a 5V,2A wallwart and connect to 5V header pin, with a diode from 5V (anode) to Vin (cathode) to avoid reverse driving the on board regulator.
http://www.dipmicro.com/store/DCA-0520
Or bring in 5V to the barrel jack and jumper across the diode and the 5V regulator?