Perhaps it's of interest how many mistakes I made before successfully adding OO Calc as a handler for .ods files Unless there are some good ways of improving the GUI, there definitely needs to be a howto in wiki.maemo.org eventually!

First, new entries to XRef did not show up at all, because I was typing in the handler manually instead of choosing from the drop-down menu. Don't know how many times I tried before working that out.

Then, in entering the file extension, it was not clear whether I needed to type in [ods] or [.ods] or ods or .ods, so I tried first simply ods. Such a faulty entry in XRef could however not be deleted, although it disappeared when closing and reopening the GUI without saving.

Well, I finally made it, and it immediately worked, without having had to reboot (as I had expected from the notice that popped up during installation).

EDIT: A more minor detail: the icon for the GUI is almost completely invisible in the Maemo menu. Only while pressing on it do I briefly see a greyish wormlike thing.