Your welcome.
If you are on Windows there are the weird Windows windows rules regarding Cubase being spread over two screens. Do you have the mixer set to full screen, if so did you try it the other way 'round? (Now would be a good time to go to the User Control Panel and add your system info to your sig. It’s brain-numbing to ask the same exact questions over and over.)
Anyway, if people show a consistent interest in the specific FR of having context sensitive key commands It might get some traction. It’s here: Steinberg Forums.
It is also possible that the decision has been made already, they are revamping the project window for a future update.