Assign allow interpreters in practice mode

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Hi it would be useful to allow interpeters into practice mode. When conducting a huge webinar, you want to make sure everything has been set-up correctly when starting live broadcasting.

Now it just a gamble, hoping that the interpreter did sign in. If they did, everything works great, otherwise it creates a lot of stress. Searching in the participants list for the correct person and assign the role.

If this could already be don in practice mode would avoid lots of stress.