In the skin file there is an option to use single letter
not sure if it works or not but asuming it does
if you wanted 16 letters A-P
[Selection]
# SelectionMethod: Alphanumeric,Numeric,SingleLetter,SingleNumber
SelectionMethod=SingleLetter
UseZero=False
HighLetter=P
HighNumber=4
DiscAddress=Relative
you would prob have to remap some keys in the control file as well in case some of the letters have other functions
you would also need to change the background image numbering to suit your layout