It's perfectly possible right now, it's just a bit hidden and requires extra work. Configure the controls for whichever input device you're using more and leave that one selected in the Device field, then for the rest of the controls, right-click each button/stick/whatever and change the Device in there to your second input device, then click Detect and press whatever button/key/axis you want to set that button/stick/whatever to.
<@skid_au> fishing resort is still broken: http://i.imgur.com/dvPiQKg.png
<@neobrain> dafuq
<+JMC47> no dude, you're just holding the postcard upside down
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<@Lioncash> pauldachz in charge of shitposting :^)
<@neobrain> dafuq
<+JMC47> no dude, you're just holding the postcard upside down
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<@Lioncash> pauldachz in charge of shitposting :^)