Gnome shell could have an extension to handle cpu governor. Some computers may require to use other cpu governor. example: I have a old notebook that gets better responsiveness using the performance cpu governor.
You'd better submit your request upstream: https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell Anyway, third-party GNOME Shell extensions already exists for what you want: http://mail.gnome.org/archives/gnome-shell-list/2011-June/msg00428.html