We are using TFS 15 with mixed teams and we like to use the activities for capacity planing a little better. But I can only set a capacity for a specific activity.
However we would like to say Bill has a total of 4.0 h a day and he can spend them on Dev, Testing, Doc, & Design as need be. Same for Joe, he has a total of 5 h a day and can spend them on Dev, Testing, & Doc.
Some sprints are very design and documentation heavy where some are mainly testing and deployment.
No, you can't do that. You can submit feature requests to Microsoft on User Voice.