I have a gantt chart with tasks, resources, and assignments. I want to enforce a many-to-one relationship between tasks and resources, that is, I want to be able to assign a single resource to any number of tasks, but each task can only have 1 resource at a time. A (conceptually) simple sample implementation would be to change the checkboxes to a radiobutton in the 'assign' dialog window, from the 'edit' dialog.

I understand there is currently no way to enforce this type of relationship or the restrict the user from selecting more than 1 assignment in the assignment dialog window, so I am requesting a way to do either (or both) of these things. I would imagine a setting in the gantt or taskDataSource for enforcing the relationship, or a setting in the assignment field for switching the dialog box to radio button like behaviour.