It would be great to be able to set the volume of tablets individually.
Sometimes there is a tablet playing music but I want the music to be louder and another player wants it to be quieter. We can't both individually change the music on the tablet, as it changes it for everyone.
My suggestion is to add an option to set a tablet's volume for yourself. With this, if I wanted to make the music louder I could and the other player that wants it quieter ALSO could change it to his liking. This doesn't just apply to music of course, if one player is watching a video tutorial on a tablet, being able to mute the video for myself because I already know the rules would be very nice.