No, it can't be completely turned off. However, pressing the 'o' key opens and closes the tab at the side. The only way to disable it is to remove the mod.
Copy the minecraft worlds from the file explorer
you link it to your minecraft account
yes.
Minecraft
No.
No, only if you delete your .minecraft folder, minecraft isn't 'installed' so you can't uninstall it either, just deleting it from your desktop does the trick, all your worlds will be left alone.
Well there is one way to get into good worlds in Minecraft. Type in a seed.
minecraft worlds on PE are finite, and the water beyond that is infinite.
Sambotambo0.0.4
No it doesn't because it is just like force upating but you do need to update your worlds.
delete your BIN and then run minecraft, it will then be cleared and restored, this doesn't change your worlds.
First you must access .minecraft, a hidden folder in My Documents/Application Data. Go into the saves folder to see all the worlds that are on your computer. Now you copy the worlds you want from your computer, put them on the other computer, and paste them into .minecraft's saves folder.