If you didn't notice, both of the ideas I had were for a speedster but can be utilized for other people. I would say that a room would have been set up for Flash for the PAT that would have rubber bullets getting shot out of fixed and moving positions so that it wouldn't need a human operator.
The plan is that Misty has seen Kara working with Cisco, Caitlin, Felicity and Dr. Wells in STAR Labs. Misty would know about Kara's power and skills with computers so she would call Kara to help with the search for Deathstroke and to help make suits for the new group.
My idea for her role is to basically be the Felicity of this team. Helping them out from behind the screens.