So the old requests dialog had a dropdown for "Filter Friends" which allowed a user to select from their own custom friends lists.
But the new Requests 2.0 only allows us to select either Installed or Uninstalled users or create our own set of filters. Is there a way to enable the old filters? Because the only alternative I know is requesting the user to give our app read_friendslists permission and then querying for those lists.
The requests dialog has the ability to allow the creator to pass in the filter lists you want to show. (See https://developers.facebook.com/docs/reference/dialogs/requests/) You will need to know what their filter lists are to be able to do so.
Check out http://developers.facebook.com/tools/console/. I've found some good information by reading thru their various examples. Valuable information that is not disclosed on the main documentation pages. This is where I came across the filter selection for the dialog.