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I think you misunderstand what "SMS mode" means. The Game Gear itself has two operating modes in hardware: SMS mode (where it basically behaves as a Master System) and true GG mode (which has a different screen layout and colour palette, and stereo sound, with other small changes as well). It's set via a pin on the cartridge slot.
The most obvious use for the SMS mode is for the Master Gear converter, but many "real" GG cartridges (Castle of Illusion is just one example) are actually SMS mode games, and the dumps are distributed as SMS ROMs.
BTW Sonic Blast GG has been dumped, the ROM just hasn't been distributed yet, which is why it doesn't appear in GoodGG.
Mike |