there is a thread already for cssu discussions and questions, requests.
post there.

also,
turn by turn navigation, with voice guidance is already possible and has been so for a while thanks to Blaizzen and others who contributed.

http://talk.maemo.org/showthread.php?t=66985

one more thing, the cssu is maintained by people from this community, not nokia, they are working in their free time.

so I think the title is a bit bad, discussions are done openly in the cssu thread, no need for insiders.