The change would have to be in the DNS (dnsmasq) , but I don't know what your desired operation is.
If I have 2 PTR records like
192.168.1.10 myserver
192.168.1.10 myothername
and the client asks for a resolve of 192.168.1.10, what name do you think it should return and why ?
What I would like to do is to be able to choose between "mynameserver" and "myothername" in this case. As it is now, it is undefined (Or, at least unknown to the administrator).