I have installed Mobile Maps 10 on my N900, and I have also purchased the MM10 Australia/NZ maps from Sygic (for Android, doesn't matter I think really as long as it's not the iPhone version).

I installed MM10 according to this post:
http://talk.maemo.org/showpost.php?p=815580&postcount=1
The package name is mobile-maps-10

Then from what you bought/downloaded from Sygic, put Res/ Maps/ and Drive/ (see below) under the N900 internal flash (i.e. under MyDocs/)

The (a little bit) tricky part is Drive/, as you won't have Drive/Maemo for AU/NZ map.

I used Drive/Android and renamed it to Drive/Maemo
Those ini files are mostly fine I believe. But if you're desperate, compare the ones from MM9 /opt/sygic/Drive/Maemo. In particular, keymap.ini, which you may want to update those keycodes according to the MM9 ones.