There is an interesting project by Dandare spanish user, called Dandanator,
Dandanator Mini, an interface for any Spectrum model, that shows a menú like a multicart. The games compilation are created by the user via software.http://www.dandare.es/Proyectos_Dandare ... ts_EN.html
There are two emulators (ZesarUX and Espectrum) that emulate this interface.
The question is: could be implemented on MiST spectrum core ?