Hello :) It would be nice that experienced users shared their make.conf and src.conf to help new users like me :) I know that there are man pages and I read both of them, but real user's configurations are IMHO also helpful!
# Modules to build instead of all
# MODULES_OVERRIDE = linux
# Modules not to build
# WITHOUT_MODULES = linux acpi
Usually anytime there is a WITHOUT_ option there is also a corresponding WITH_ option.