Identical members roles on all sites in a multisite

In a multisite system I need editorial accounts with custom rights. Therefore I have chosen the members plugin. As I do have lots of sites, creating and synching the roles for all sites becomes quite tedious.

a) is it possible to manage my roles for all sites globally (network-wise)?
b) would you suggest to use a different plugin?

You can’t use Members to do exactly what you want. I use WP eBooks’ “Network Roles” in tandem with Members to accomplish what you want: http://wpebooks.com/network-roles/