Like in a web browser if we could go back to the previous page (conversation in this case) it would be pretty usefull for merging and "linking" conversation together.
Frontline users can see rule logic with view-only access
This will help with transparency as to how/why messages are getting assigned to them or not. This could be managed with a view-only permission for custom roles.
I think it would be important that drafts created with another email client (e.g. Gmail) could be synchronised in Front. This would allow us to avoid having to change clients several times a day.