I've spent some hours trying to get my n810's built-in hardware keyboard working well, and feeling disappointed.

I've managed to get the following mappings to work:
Delete key on Fn-BackSpace
braceleft on Fn-m
braceright on Fn-;
bracketleft on Fn-,
bracketright on Fn-.
Tab on Fn-space

I'm trying to do the following mappings and they are not working:
bar on Fn-shift-backspace (bar is also known as the pipe character)
escape on Fn-z
Page up on Fn-dpad-up
Page down on Fn-dpad-down
Home on Fn-dpad-left
End on Fn-dpad-right
F1 on Fn-shift-q
F2 on Fn-shift-w
etc... (F-keys all mapped to their numeric equivalents when looking at the keyboard)

Unfortunately, it seems that none of these Fn-shift mappings are working. When trying to get escape with Fn-shift-z, it always prints z instead. The locking behavior of the Fn key seems to disappear whenever I press Shift. Also, the deadkey behavior of Fn doesn't seem to happen when using the dpad, so I have to hold down Fn while pressing the dpad which is very awkward.

I'm willing to post what I have working so far, but I'm still in the middle of trying a lot of other things and don't want to confuse others just yet.