ShortcutBerry has accomplished something that I have wanted on my BlackBerry for ages. The ability to set shortcuts for pressing convenience keys multiple times. It has 27 out of the box shortcuts for major BlackBerry applications and 15 user customizable shortcuts. My favorite setting is the ability to assign 3 applications to each convenience key by hitting the button twice, three times, or four times!
Right now it does not look like the application is for sale but there is a 45 day trial for you to play with it until they do offer it for sale. Definitely worth checking out.