Cool, thanks for your feedback Mattias.
The more i think about this concept the more it makes sense for me and is super appealing.
In a large project Producers or Lead artist don't necessarily need to assign all tasks to a specific user. The freedom of saying for example these are alle the 3D modelling tasks and i assign them to the 3D modelers group seems very nice. These tasks then appear under the 'available task' column in the my task view for everyone in this group and if a 3D modeler drags a task to another column 'in progress' for example it gets assigned to him/her directly and disappears from the 'available task column for everyone else. So they just work through the pile as they like.