Using in multisite

Hello

Thanks for this lovely plugin
it works just fine
but, is there a way that only superadmins can use it in multisite?
Now I can use it perfectly but, the admins from every site can change the settings.
It would be nice if I could say, that only a specific role could acces the settings.
Is there a way of doing this?

I did not find any translation files but I can translate it in dutch if you want.
(if you can give me the po files)
Thanks.

Peter