piCorePlayer and LMS

Hi
I have a PI with LMS and synchronised 4 PI's with a HifiBerry Dac/piCore in my living room and kitchen.

It works great, but ..

1 is it possible to synchronize the volume. I now have to change 4 PI's to increase or decrease the volume and that's not working fine.
2 is it possible to shut down all 4 PI's in one move.

I looked in the threads but found nothing about this issues.

Is there anybody who can help me?

I Hope,
Peet