Feature request: Ability to add also an webmaster tools key

First of all i really like your plugin, works super!

Like the title already saids: Feature request: Ability to add also an webmaster tools key.
So for example you can add your:
1. Google webmasters meta key
2. Bing webmaster meta
3. Yahoo site explorer meta
4. etc

I hope you like it and make this possible in a next version of the plugin,

Thanks