How about this Solution: make the case a bit larger, and put 3 USB Ports on a Custom Frame on the front of the Case, then put 3 USB Cables inside the Case on the Pee, and you the 4t Cable between the 4t Pee USB Port and the Retrode
This way you sacrifice just one USB Port, but make it just User Friendly plug and play..
Also: when you wants to Put Genesis/Megadrive and Super Nintendo Gamecardridge on, the Case enyway have to be a bit larger than the Pie, so this should work..
And whit the 3 Separate USB Kables Put in the Frame, you also have the Whole USB Speed whitout need of a Hub..
This way you sacrifice just one USB Port, but make it just User Friendly plug and play..
Also: when you wants to Put Genesis/Megadrive and Super Nintendo Gamecardridge on, the Case enyway have to be a bit larger than the Pie, so this should work..
And whit the 3 Separate USB Kables Put in the Frame, you also have the Whole USB Speed whitout need of a Hub..