So, I got a Steam Controller Friday. Naturally I had to test it out with Sacred 2. For those who are interested my WIP Bindings can be found on Steam. They work beautifully! I've tried playing with Xpadder as well as the PS3 port, but neither of those felt right. This does. With the current bindings you do need to use the mouse to select skills, weapons, and relic sets, which for high level play will likely be an issue (I have two combos that sever my Seraphim well enough for the skills, and I don't use weapons). So far I've mostly been fiddling with the bindings and haven't done any heavy play, but will start soon. If you have any questions, please feel free to ask!
There is a single issue. I made the left pad a "scroll wheel" (which is an iPod style scroll wheel, as opposed to what's on a mouse) cycle through skills. When I open up chat, I can see that the numbers 1,2... are being input correctly, but the skills aren't changing.