Button Remapper: shows only Mediabuttons!

Hi,

Mobile: Star S7599 (MTK6589)

Problem:
a) BT-Headset and BT-Keyboards: play/pause buttons do two things
1. play/pause
2. and additionaly: show "all homescreens I have in small ones" and when I push again I get the full homescreen

Solution:
I think I have to deaktivate my hardware Homebutton for the entire Androidsystem.

So I hope that the mediabuttons of the Headset/Keyboards will only do its job play/pause

Thats why I buyed the app "button remapper". But why do I get only the mediabuttons (look at the screenshot)?

Can you explain it. And can you tell my how to deactivate the hardware homebutton? is ther a solution via an Xposed plugin or somothing like that?

Attached Thumbnails