When I want to add a test as a step, it would be nice if when I click the "Test as Step" button, I could just start typing to filter the tests instead of needing to click on the text box.  I always have too many tests to scroll through, and always need to filter, so it would be nice if I could just start typing instead of clicking on the text box.
The same concept goes for changing the primary target of a step.  When I click the ellipses to update the target, I often just start typing to find the object I'm looking for, and then remember that I need to go click on the text box.
It's not a big deal, but it is a bit of a hassle that should be an easy fix.