I'll second that...it would be nice. And type ahead doesn't work until you click into the box....then it still doesn't work that great.
On the other hand, I will politely disagree. I prefer the category default. Not only is it what I have come to expect, but I often do not remember the precise name of a script step, but since I do recall it's function, selecting the category will take me close enough to be able to quickly find--and sometimes compare with different steps in the same category, the step that I am looking for.