Bulk add user to individual groups and projects

So, in my team I have ~30 groups and ~60 developers.

Each developer must be part of some groups. Now, to assign a developer to a group I have to go the the group page (in the admin area) and setup members from there. So, if a developer is part of 30 groups I have to go to each of the 30 groups separately and setup member there. It is not funny...

why not go to the page /users/[user_name]/projects and setup groups from there. I can already see his groups and pages but I can not update his groups membership.