Currently, MegaSD starts the last loaded game when the console is reset or cold started. This is quite annoying IMO, particularly with Master System games which does not support the in-game menu and requres to hold the button on the MegaSD cart.
I'm playing on a Mega Sg which essentially does a reset when selecting "Run Cartridge" from the Mega Sg menu. With other flash cart solutions (for example the Everdrive X7) "Run Cartridge" allows the user to always return to the cart menu and quickly select another game. On MegaSD, the user is always forced to use the in-game menu key-shortcut to return to the menu which is slower and not always possible (Master System).
Anyway, this is a suggestion in good faith and I hope it's possible to implement, maybe as an option.