Kanban has a practice of limiting the work in progress in a particular stage.

It would be good to have this!

e.g. in a particular stage, the ability to define a soft limit on the WIP, which could be:

- number of tasks in that stage for the project

- total of estimated hours of tasks in that stage for the project

- total number of tasks assigned to a user

- total estimated hours of tasks assigned to a user

When that WIP limit is exceeded, you'd want to highlight that it's over the limit.