I think the use of a team kanban board is a great idea (maybe we'll use it for this project) but one thing I've noticed in your post is that even though you found it to be useful if the whole team isn't participating in using it, then the momentum of the project could fall apart (at least temporarily) as a group scheduling tool like that seems heavily reliant on everyone using it. I do worry about things like that happening in future projects because no matter what you do if your whole team isn't contributing to it, it doesn't feel as effective. I guess it is good for finding out who is having trouble with keeping track of things and that in itself is a useful thing to know.