Question to Mer on Q5 users about hardware keys.

How do you think the hardware keys should be configured?

Lets call the Q5 keys (in order): Power, Minus, Menu, Plus.

My current configuration is:

Power is the same as in N800/N810
Menu is Shift
Minus is F8 (Zoom out).
Plus is F7 (Zoom in).
Menu+Minus is F4 (Menu in Mer)
Menu+Plus is F6 (full screen in Mer).

Can you think of a better configuration? What are the most important hardware keys in your opinion?