Hey, what about WIP limits?
That's one of the basic things useful for Kanban, yet Trello does not implement.
+1 Great idea, without is nonsense about visual management
+1000 Agreed! Without WIP limits you can't do proper LEAN project management.
Someone already asked for this feature on the repo.
As that guy said: "Otherwise kanban board is just a pretty thing without real management power." LOL but true!