/usr/share/keyboards/en_US.vkb (or whatever localization) can be hex-edited. On mine + is on the unshifted keyboard making entering negative numbers annoying.

There is a perl script that can turn it into editable XML, but if you can find that, hexedit should not be any worse.

/usr/share/X11/xkb/symbols/nokia_vndr/rx-44 (the name may vary, but this is also on the rx-48) is a text file with the regular, shifted, and function keys.

I tend to replace the currency symbols with something more useful, e.g. yen (since I think the sharp zaurus yen gave the bar).

Mine has a line reading:

key <AB01> { [ z, Z, bar, bar ] }; (with tabs and spaces condensed).

I also have a bug filed for the virtual keyboard (vote for it if you have the problem)

https://bugs.maemo.org/show_bug.cgi?id=3976

Since the rx-44 file is editable (and there are threads about it) I haven't filed bug reports, but have escape, tab, brackets, braces, bar, and other characters replacing things including where function and shift map originally to the same thing. It is by localization so mine is in the US English section.

Yen is | (bar)
euro/pound are brackets.
Function-greater/less are braces.
- _ adds escape
+ = adds tab
' ? adds grave (`)
(I may swap the escape and tab, though they are on the bottom - you can do these in the Xterm bottom pickbar, but other apps or dialogs don't have that, for example osso-statusbar-cpu to run commands with pipes)