multisite child blogs global registration

hello,
I have read a lot in this forum about multisite global login, but i have not a clear answer for my system.
I use wordpress mu child blogs + buddypress +s2member ( Unlimited Pro + Network support Licence)
Users can register with or without membership, but all are not allowed to create blogs.
The wordpress is one installation with Buddypress and have child blogs within :
http://www.foo.com/blog1, http://www.foo.com/blog2 etc ..
Some child blogs are for the multilanguage access registration :
http://www.foo.com/en-register, http://www.foo.com/fr-register, http://www.foo.com/it-register etc…
Other child blogs are content for members or not members, and each child blogs have different members level access.

I would like that all the members can access to all blogs according to their level when they subscribe.
I mean , when a user s registrant for example from the access in English (www.foo.com / in-register) for a Level 2 subscription, that it has access, automatic way of only the contents of all Level 2 other child blogs of all languages​​.

For the multilingual, I need that all members to have the registration process and paiement in their own language including email and come back after validation inside the activity page .

i want that members are not allowed to create blogs.
I have bought all the s2members pack, i mean pro unlimited site and network support licence, i have read that network support licence is needed only if members can create blogs , is what i ‘ ve need anyway ?

How i can do all that ?

thank you

no idea ?