Unfortunately not everyone behaves like a sensible adult when travelling with other people. Like Bob, I do not like sitting at the back of the coach as I do suffer from travel sickness, but I would never 'hog' the front seat where I feel more comfortable. I do not mind if the front seat is taken by someone like Dyuti, but I do mind when people leave their bags on the seats to reserve them and do not co-operate. Sometimes there are not enough seats on the coach for everyone to sit by themselves, so there will be occasions when you do have to sit next to someone else despite liking your own space. When I did the Kerala trip, the TM was adamant about seat rotation and no one minded. On other tours TM just asks everyone to rotate so everyone gets a chance to sit at the front if they so wish. It is nice if people rotate at dinner as it gives you a chance to talk to different people, but again it does not bother me if there are a few who do not like to rotate and sit with the same people they know. At the end of the day it is their loss, not mine. In my opinion one has to try and be flexible depending on the situation instead of being selfish, especially when travelling with a group.
Regards
Jaya