You mean like in the screenshot I have attached here?

Pretty easy, actually. Just took some searching and the realization that a local .gtkrc-2.0 file is not looked at in Maemo.

Pick your favourite theme to edit and go to the appropriate directory in xterm (ex. "/usr/share/themes/glasser/gtk-2.0/")

As super-user ("sudo gainroot" after installing "becomeroot" package) edit the "gtkrc" file in that directory.

Add the line:

somewhere in there (I did it after the short HID section near the top). Restart your tablet (may be unnecessary, but I was having some stability issues that may have been caused by this change or by another application I was using). Make sure you have the theme you modified selected, and most applications will now be left-handed! To get the web browser left handed, follow the link earlier in this thread. xterm is the only application I have come across that ignores this change.

I regret there is no easier way to do this. Having to make this change for every theme sucks. The problem seems to stem from the fact that hildon looks at the file "~/.osso/current-gtk-theme" to get the theme information. There is only one line in this file (pointing to the current theme location) so you can not include a second line without having it overwritten each time you change themes.

If this process is too difficult for a lot of people I could package up the default themes as left-handed themes. Let me know if there is interest.