En los foros de dextrose he encontrado una parte de una entrevista de IGN pocket a uno de los responsables del GB Player preguntándole sobre cosas técnicas.
Aqui esta una parte de la misma q puede resultar interesante
IGNpocket: Can Game Boy Advance software access the modem or broadband adapter plugged into a GameCube, in terms of a GBA game utilizing the modem or broadband adapter for multiplayer gaming?
Sashmoto: Technologically speaking, it's definitely possible. Whether or not anyone will do it, that's up to the game makers.
IGNpocket: Can developers implement specific elements in their Game Boy Advance that will only affect players of the Game Boy Player? Like the rumble controller feature of Pokemon Pinball Ruby & Sapphire?
Sashmoto: The goal was to give players the ability to play the Game Boy games on the television, that's it. So the Game Boy Player has to equal a Game Boy Advance. Those are equal units. The developers of Pokemon Pinball wanted to implement a rumble feature, and the Game Boy Player let them do that. It's as far as I know, a one-time deal.
IGNpocket: Can developers add specific borders on their Game Boy Advance games that can be displayed on the Game Boy Player, like the Super Game Boy did with specially enhanced games?
Sashmoto: Those twenty borders on the Game Boy Player are set, they can't be added or upgraded through the GBA software.