CGRemote will be able to do this soon. It's still in development while in beta so there are many features that aren't yet finished, but it will make managing all miners from one computer very easy. It will work with miners on any OS but for miners running CGWatcher there are many more features. Along with being able to switch all (or selected) miners to a different coin, there will be scheduling options similarly to scheduling options in CGWatcher but they can apply to several or all miners. Right now you can already create, edit, and delete CGWatcher's profiles for each miner; create, edit, and delete files on remote miners; navigate the remote computer's filesystem; start, stop, restarting mining; and a few more things. CGRemote can monitor miners on the same computer, local network, or over the Internet.
You can follow development and information on beta access at
http://www.minerremote.com