I finally finished implementing custom cache directories (and it now plays nicely with other commands ;-)). This is also the first version to actually have a config file. I'll update the OP with the new package.

Also, I think I'll start a garage page for this thing. Even if it isn't used by anyone else, it will be handy for me to have version control and a backup just in case something happens to my N900 or computer.

BTW, while packages aren't removed automatically (to keep the cache clean, it is trivial add the option:
Or, if you are low on space in root...