I'd like to use this on a MU install. However, I don't want to have to configure this for every blog. In fact, I'd prefer to have this be network configured.
As a first step in that direction, the options need to be saved and retrieved using update_site_options and get_site_options instead of update_options and get_options.
Additionally, the code update needs to migrate options so that people updating this plugin don't lose all their settings.
It is also ideal if this worked without relying on the activation hook since mu plugins don't trigger that hook.
Lastly, the settings UI needs to hide from the admin settings and display on network settings if is_multisite() == true.
I believe I've covered all of these issues in this diff. I'm happy to send the raw plugin php files instead of a diff if you prefer.
I'd be much obliged if you could include this in the next release so that I don't have to fork the code for my own projects.