About permissions

Hi everyone!

ok, i have just installed G2 and i was playing with the settings in the admin panel and i have discovered that is posible show just thumbnails to unregistered users and the full picture to registered users, but i was thinking if is posible that an registered user don´t can see the pictures of another registered user, i mean, if i "jarkaos" have an album with sub categories and i don't want that the registered user "bbbbb" see my pictures but just the thumbnails, how can i configure that kind of permissions?

My second question is if there is an option to make bulk upload. If i have an ablum where i want to upload 100 pictures in it, i dont wanna do 100 upload but just one.

And my third question is if there is some kind of add on or plug in to make zoom to the pictures.

Thanks for your answers.
Jarkaos