General :: Controlling And Modifying Power On / Off Function - Sony Xperia Z

For reasons that are explained here: Alternate Power-off Option? , I am wanting to try a couple of ideas for controlling/modifying the power on/off function of my phone (Sony Xperia Z). I never wanted to root this phone but now it seems like I'm going to have to to give me any fighting chance of getting around the issue I'm currently in.

Anyway, what I need to know is if any of the following things will be possible if I were to root my device:

--- Disable power button from waking screen or doing anything else, and preferably set a combination of keys to be what lights-up the screen, (e.g. nothing will happen on the phone unless for example the volume up key, then volume down key, then power button are pressed in that order). Then, if this is achievable, would it be possible to keep my mobile internet data turned on, while disabling people from calling me, (so that my phone won't ring at all)

--- Edit the power off function on my device so that instead of just turning off, it reboots instead. (However in saying this I would want this function hidden, as in, I want there to be a button that says 'Power Off', but instead of just powering-off, it does a reboot instead).

--- If the above is not possible, is there some sort of light 'sleep' mode that my phone can be put into so that it appears off, however can be automated to turn back on at a set time. (I understand that Android's can't be woken when shut-down because they literally are completely shut down and can't run any apps, but maybe there's a way to have it in a sort of 'sleep' mode where it can be automated to turn on at a set time?)

--- Any other option that will either A) make someone think my phone is turned off when it's actually still on, or B) allow my phone to turn back on automatically at a set time, or do a reboot instead of shut down when 'power off' is chosen.