Bear in mind the Xbox 360 controller drivers are made by Microsoft and built into Windows – while it’s feasible that Valve can make their own (and they probably will since a lot of Steam games now have built-in controller support), there may be some difficulties in making it happen.
That said, the PS3 controller has third-party drivers and I know of at least one Mac OS X port of the 360 pad’s drivers, so I’d imagine it can’t be
that hard.
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SteamOS will be opensource. They can just do nothing and there will be console controller support anyway
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A big part of PC gaming has always been modding, too – I would bank on Valve encouraging people to get involved. I have to imagine Valve will be trying to bring in Steam Workshop and other stuff, too, to try and sweeten the deal.