Hard mode (disable "cheat" features)

[kdx2a]

Hello again :)

This suggestion is similar to popular emulators hard mode, i.e. Retroarch's one.
Activating it kills the current game process.
It would mainly disable turbo keys, savestates, fast-forward, and all the upcoming features that weren't available on the original Nintendo hardware.
In addition, "Hard mode" stamp text would be displayed in a corner of the calculator screen.
It would allow players to beat a game on this emulator and prove than they did it the hard way.

Thank you ^^