Add feature: Managing Collaborator Permissions

Good afternoon,

I would recommend to add a feature:

As an admin you should be able to update and restrict Collaborator access. Particularly I do not want my clients/collaborators to be able to change task statuses or assign new task. 

I understand that ideally clients are educated and aware that they should not change tasks, however everyone in project/client management knows that this is not always the case. Having the option to limit this would be a great value add, in fact a necessity.

Thanks in advance - please keep me updated on adding this feature.