Lock/disable XBMC volume control

Hello,

I try to lock/disable XBMC's volume settings.
Reason: In my home cinema setup volume is always regulated by the AV-Amp or the TV. XBMC should not tamper with it and always output the maximum level. However, all web interfaces, smartphone apps etc. for XBMC offer the user to regulate the media software's volume, so there are always situations in which my family breaks the setup by using different ways of controlling different volumes.

Is there a way to do this?

Thanks in advance!