I know that this is in an early stage but here are some ideas for the future use of this app

on desktop:
right->menu
left->task manager
up->hildon status menu(if possible)
down->nothing

on menu:
right->task manager
left->desktop
up->hildon status menu
down->nothing

on task manager:
right->desktop
left->menu
up->hildon status menu
down->close all running apps(if possible)

on app:
right->menu
left->task manager
up->hildon status menu
down->close the app(if possible)

on call(incoming):
right->menu
left->task manager or silent
up->hildon status menu
down->reject call

on call(while talking):
right->menu
left->task manager or mute
up->hildon statuse menu
down->end call