My GBA-GCN connector actually doesn't cover the shoulder buttons at all, so that isn't a problem for me. I have also had a connector that almost completely covered the shoulder buttons, which was a great inconvenience.
Nah, I mean that where the rest of my fingers from mid-finger out would normally be, an ofikal connector piece is. Makes for any shoulder-button-intensive work to become weird, since my hands would have to adjust to holding the SPee solidly and controllably while still getting a good positioning for teh sholdarz.