For #2, go into the remote settings and turn off Cursor Navigation.

For #1, programm your volume hard keys on the System Page and then do not add any labels or actions to these buttons on each activity, including Home.

There is an FAQ here that may answer some of your future questions. The Editor should also have an excellent F1 Help file. Maybe not if it is for Wizz.it. I know I edited the one for the Philips remotes so I am aware that it was for sure very comprehensive. The topic you are looking for for #1 is called punch-through.