First off - great little app! It fills a niche in my attempt at "no-mouse" navigation of the OSX GUI.
My suggestion: if no keystrokes are input in the input field, and we tab to the list window (showing ALL apps), that a keystroke here would take us to the first item-name beginning with that keystroke. Right now you have it so we can traverse the full list with page up/down keys fairly quickly, but to make a selection, we have to use the mouse to make the selection, or Shift-tab back to the input field and type the name just observed in the List window, or scroll a 2nd time (this time sequentially) to actually launch the item.
So, selection-by-keystroke within the full list (at least by single keystroke, if nothing else) would put this baby over the top for me (and others, I'm sure)
Tom
QuickerPicker
App launcher, lists all apps
Version: 0.9b