Hello,
after study the source code for 4 days,
this is my quick fix of wiimc 1.2.7. dol and source codes.
by holding B and button 1 together we now can increase the value in steps. (brightness+0.05 & contrast+0.015),
hold B + button 2 will lower the brightness & contrast (brightness-0.05 & contrast-0.015),
to reset the value, simply hold B and press A button.
download:
http://www.mediafire.com/?43twgu3mjooihjr