remove 'register link' from admin bar

I am using custom admin bar from wpmu dev and also the admin bar improved and it is almost perfect now, I just need one thing extra.

I would like to know how I remove the ‘register’ link in the admin bar for non-logged in users?

Basically I want to do this to force people to login with their Facebook, twitter, or google plus credentials through my login portal..

I would also like to rename Login to Login/Register…

Not sure if this is hidden in buddypress or wordpress as when I inspect the element it appears to state admin-bar-bp…

Any thoughts would be greatly appreciated!

Cheers