Feature Suggestion: Assign multiple tasks as waiting on at a time

Waiting on is a great feature, but is really tedious to setup if you have many things something is dependent on. It would be nice if there was a keyboard shortcut that would allow you to work the other way and find all your waiting on tasks first (shift/ctrl select them) then TAB + . (or whatever shortcut key) and show a search box that would allow you to find the task that is waiting for the selected tasks to be completed.