I think it would be possible (afterall the client can communicate with the os and gserver, and those are separate programs, afterall), actualy its more like, I don't see why it wouldn't be.
As for copyrights, I highly doubt one would have to pay gO (gO standing for "graal online") for making a program that does spiffy stuff from reading game variables*. My reason for saying this is that gO doesn't have to pay microsoft and apple for making a program that uses their operating system.
*hell, if you knew something about hacking hex like they do with trainers, you probably could make such a program for reading game variables right now without graal intending it to happen... but I don't know a thing about hex hacking (other than on the gameboy 
) so I sugest this modification to the game only my idea is for reading stuff, no writing.