I miss it from normal power key behaviour.

Yes you can tell me to not use power menu.

Reason I am using your power menu is that I have accidentally shut down my n9 when taking it out from tight pocket.
Would be nice to have it vibrate so I can fast release powerbutton before 9sec.
Also I think it feels odd to long press powerbutton without vibration.

If you dont want to add it then dont.
But theres many users that want vibration feedback.