I use Xbox 360 for Windows controller (VID 0x045E, PID 0x028E), and have the controller chatpad attached, but that doesn't work in-game, alas I cannot provide IDs for it.
I see the steam controller has a price now £39. Not a bad price, but I'll wait for revision 002 before buying one. I guess supporting this for ED will also be something to look into soon, and the full haptic feedback support inc trigger feedback. One step closer to full and proper force feedback support right across the game universe.