Since I've managed to add .ods and .odp handling, I now want to do something more useful for myself (I'm not really using OO much), namely to add support for e.g. postscript files. I would like to have them handled by Easy Debian's evince, because the Maemo version is not capable of that and more excitingly I could immediately print them out from evince on network printers via CUPS.

Evince in Easy Debian can handle the following mime types
But I have no idea how to include them, associate them to the corresponding file types, and map them all to "debbie evince". Is that at all possible through the GUI, or do I need to manually edit files (if so, which)?.