Hi Manuel,
I can't speak to the VIM product, so I'm not sure, but basic achievement of SPNego-based SSO to an AS Java shouldn't be too hard. I wrote a blog about this (for NW 7.01, using Visual Admin instead of NetWeaver Administrator, but you should be able to translate it to NW 7.4), and perhaps it will help: Single Sign-On for Java with SPNego.
Cheers,
Matt
