support for older versions of browsers

I just noticed that Safari 4 is the only version available?
Just hoping to see some older versions added "someday" if possible.

Most of my testing is for older browsers as is common I would think... to see what is happening with people that are not up with the times, modern browsers.

So any additions like that are appreciated.

Also... a suggestion...
It would be nice to be able to have a preset of configs... or a way to save a preset myself...
For example... I might make a selection of browsers and call it "Old Browsers" and just run that when I need to make sure things are backward compatible.

Just some thoughts.

Thanks for the awesome service!