When I'm typing in a custom rejection reason into an edit I'm already a little bit frustrated that I have to break my normal clicking pattern to try to help empty the suggested edit queue as quickly as possible. It doesn't help that I have to make an extra click before I can press the reject button.
Notice how there is text in the textbox, and the textbox has focus, but the radio button by
custom is still unmarked.
My feature request: either when I put focus on the textarea or when I start typing into the textarea, automatically check the radio button.