[Skyld]

It is possible to add a URL handler by editing the Info.plist file of the Graal.app executable, although I had little luck this morning when I tried it. It would open the application but it would very quickly exit again, not sure why yet (I probably missed something).

Also in terms of the Graal client for iPhone, yes, it already exists. You also have to consider that it's not just for the purpose of Graal development; Cyberjoueurs have a game engine which they need to make appealing to other developers, and an excellent place to start is to bring it to as many platforms as possible.