I've found that there is no problem with not returned GRLESSKEY any more (like it was some months ago).

So there is a little patch, which makes the key mappable. I use the patch for over three months already without any problem.



Notes:
The Grless key is a key placed on some keyboards between "Shift" and "Z" key. Some say the key is specific for German keyboards, but I have it on both computers and even on laptop (all Czech keyboards).

So it's very handy to map there some frequently used actions. I use it for "View Selected" (for some years even in 2.4x) and I almost can't work in Blender without it. :)