Conflict between diffrent sound controller

I have this setup:

Kodi 17 running on Gentoo Gnome3 with systemd and pulseaudio

This is my problem

If i press my mediakeys for volume gnome is set the global volume

if i press the kodi keys for volume the kodi sink is set

if i use an androidapp to control the kodi-volume the kodi sink is set

Therefore i have two different audio volumes to control with is very very annoying

Now could i deactivate the gnome volume-control but i would like to control the same volumesink inside and outside of kodi so im looking for any solution to get kodi setting the global volume not the intern volume.

I would patch the source code too but i have no idea were to start.