Code: dbus-send --system --type=method_call --dest=com.nokia.mce /com/nokia/mce/request com.nokia.mce.request.devlock_callback int32:2 That will make MCE tell SystemUI to close the keypad on n8x0 and should do the same on n900, might have to change the 2 to a 0 though. You will still need to toggle the gconf value to keep the keypad from opening when the timeout expires.
dbus-send --system --type=method_call --dest=com.nokia.mce /com/nokia/mce/request com.nokia.mce.request.devlock_callback int32:2