We often check off To-dos during a collaborative status meetings. The person who is checking off the To-do is the person sharing their screen with others in the meeting and not the owner of any/most of the To-dos being checked off. However, the person is an Aha! user with Product Owner or Contributor rights to the product that the To-Dos are associated with.
Currently, a user can only mark a To-do that is assigned to another user as complete if they drill into the To-Do details and check the box next to the name of the user it is assigned to.
This means the person checking-off multiple To-dos has to open each To-Do rather than checking off the To-do via the primary check-box next to each To-Do in the list of To-Dos that appears in the Feature view.
It would save us time and improve the UX if the user could check this primary check-box instead of having to drill into each To-do's details every time.
Note that this is already the behavior for To-dos that are not assigned to anyone - just not for To-dos assigned to someone else.
I had a manager ask me how to mark her to-do as complete and I had to figure this out myself. I'm strongly in favor of making this more obvious.