Have a 'master settings' option to update certain information on all feeds at once

After spending hours updating a large number of feeds on a slow site I would like to suggest that a 'master settings' option be introduced for those with a large number of feeds.

For instance, I have had to go through all the feeds on my account and change the URL Shortener and enter the API key for bit.ly into each one - it would have saved a lot of hassle had I had the option to change all the feeds at once from a master setting.

This could also be used to add the same prefix/suffix to each feed account, rather than having to go in/out/in/out for every one.

Perhaps even the option of having a list of all he feeds with checkboxes to say which of the feeds you would like the master settings applied to?

It would honestly save me a HELL of a long time!