Hello,
I noticed there was no com.jme.input.action.KeyUpAction and com.jme.input.action.KeyDownAction providing an action along the "Up" axis of the camera.
Is there a reason?
cj
Do you mean something like jumping? We don't have every conceivable key action, but there's no stopping you from writing one for your own use. 
not jumping. Just a way to move up and down the camera according to a certain speed (say, a "Person" wants to see the bottom of the wall, the ceiling))
Of course, i can implement it but i was thinking these classes are good candidate for the API:
such move have been implemented for "direction" and "left", why not for "top".
Many thanks,
cj