cpulvermacher
While using external keyboard with PresenceVNC, it's impossible to write my language special characters (tested on PL layout, others are probably also affected). Of course, when trying the same in Maemo (for example, leafpad, xterm or whatever), they're working fine from external keyboard, thanks to extkbd setting layout properly, upon connecting.
keyboard
Also, PresenceVNC kinda ignores my remapped hardware keyboard settings (done via editing /usr/share/X11/xkb/symbols/nokia_vndr/rx-51) - for both keys that require shift+blue arrow (layer 4), and just 'blue_arrow' + key. I've said 'kinda', because default symbols works (for example, 'blue arrow' + 'h' result in '(') but if I've changed it to something else, it doesn't recognize any symbol (neither basic or remapped - for example, I've set 'blue arrow' + 'z' to result in '˙' - ['dead_abovedot', that write standalone by writing it followed by space, or mix with other symbols, for example followed by 'z' it produces 'ż'], but in PresenceVNC, using it result in nothing - neither '˙', or '£' is shown).

Ho ever, as for hardware remapping, other remote desktop clients for N900 act the same way, so I have no idea for simple fix. Also, external keyboard issue seems to be higher priority, at least for me (+ it probably got solution in code of rDesktop).
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Thanks again for this great VNC viewer, and for will to look at keyboard issue! Fixing it is going to make life of people travelling with N900 (+ small keyboard ) easier.

/Estel