well....
if ya good in making dificult stuff,
why not make a thing like "fable" or "starwars, knigts of the old republik"?

so you start neutral with a nice dad and a bitching mom (srry if i cant use those words)
and at the beginning u can chose who dies!

kill the dad = become evil
kill the mom = become sort of evil because of bad childhood!

then go Fast Forward for like, 39 years or so...
then it is your task to destroy good or evil!
or both if you like xD

then u have made an awesomme game!!!