1. use of config.ini
if you dont use "config.ini", the default values are as follows
portchoices=220,230,240,250
irqchoices=2,5,7,10
dmachoices=0,1,3
irqchoicesWave2=11,12,15
dmachoicesWave2=0,5,6
es938installed=0

so to reduce user's selection, modify this config.ini file,
for example, 
irqchoicesWave2=11
dmachoicesWave2=5
es938installed=1
Note not necessary portchoices, irqchoices and dmachoices since they
are default.
