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I am not sure about you 6 buttons.
If you can highlight or mark one item in the list, you need 2 buttons to scroll and one to select.
confirm could be the same as select, just pressed again.
back to parent is just selecting directory ".."
reset to current? what is that supposed to do?
At this point, I am beginning to think that I should supply the machine code via USB from a PC as compared to obtaining the machine code from a microSD card.
I use a device with a wheel button. Love it.
Rayman has an LCD interface module to connect to the Prop
You cannot go wrong learning how to put graphics on an LCD.