Holding down key on 3rd party keyboard fires keypress repeatedly

I'm using a PLU ML-87 mechanical keyboard on OS X 10.10.1 (although this problem was reproducible on 10.10, and the 10.10 betas... I have never run 10.9 on this computer).

When I hold down a key on this particular keyboard, the keypress event fires repeatedly. This is perhaps best illustrated through this video of me holding down the caps lock key or through this image, which shows the keypress event in javascript being fired >1 times when I held down a key in an input box:

Plugging the keyboard directly into the Air's USB port rather than a hub does not change anything.