Actor in use case diagrams

[dirkme]

Hi, the actor in use case diagrams cannot be displayed as a block when its
instantiated, only when its referenced. Can this be changed please? We use it a lot since we mostly model systems.

Also, I would like to know what the purpose of the "Role" property of an actor is. If we already have a stereotype for an actor, why do we need a role? Shouldn't the stereotype indicate what type/role of actor it is?

Thanks