not sure about the keycaps (never used), but in my email, when i start typing a name or #, it automatically drops a list down with my contacts that match. not sure why this wouldnt be working for you.
on another note, r6 is coming along very very nicely. many updated packages and stability and speed seem to be better as well.
For any of you that want to start following me on twitter, here is the address.
http://twitter.com/kushdeck
i will start updating it often.
-deck