sorry, I was not specific enough. The custom ask box widget above will especially add a button "ask" in the end of the input line, and improves the design (you need to copy the css provided to your themes' styles.css). Apart from that it is similar to the original one.
Tip: Check the code and use the CSS that I put in qa-plugin.php to design your own custom ask box. To *reposition* the askbox and to tell q2a on what pages it should display the askbox, go to >Admin >Layout >Available widgets