How to choose a application without using the mouse in Lion Mission Control?
Solution 1:
Try hyperswitch (https://bahoom.com/hyperswitch) - you can switch between windows only from current desktop.
Solution 2:
No. I haven't found any, but that's not surprising. Mission Control was provided for mouse / touch interaction. Have you tried using Command ⌘+Tab for app switching and Command ⌘+`for window switching?
They are much more efficient if you're interested in keeping your hands on the keys.