Remap Left Spacebar key on MS Sculpt ergonomic keyboard I'm using the Microsoft Sculpt Keyboard with my Macbook Retina, on Yosemite. This ergonomic keyboard has a split Spacebar key, like so:



I want to remap the left Spacebar key to Backspace to simplify my typing. On Windows, a custom driver enables this remapping out of the box. However, this driver is not available on OS X.

I've already installed Karabiner and experimented with remapping keys. When I start up the EventViewer in Karabiner, both keys show up as KeyCode::SPACE. Is there a lower-level keycode I can access to differentiate between the left and right Spacebar keys?

Any alternate solutions are also welcome!
The best thing I've come up with so far is to use Right-Alt as backspace. Not quite as good, but it gets the job done.