Membership network-wide default settings, WordPress roles, registration

Hi, I have questions about the Membership plugin:

1) Is it possible to Membership plugin have default settings over the whole network? I’d like to use the plugin to achieve per site registration. Sub site admin would only see necessary Membership menus to handle registrations and roles, and other settings would be correct by default.

2) Also, when user registers on the sub site it would be important that he also gets a WordPress role on that site. Is that possible? I’m using bbPress plugin to create a forum on the sub sites and it uses WordPress roles to handle user levels. Is the Integrated WP Roles add-on a solution for this?

3) Do I need to use a special Membership registration form when user registers on a sub site (and not the WordPress default one)? How about when the user creates a new sub site?

Thanks!