I used to have a feature on my site that allowed people to create custom RSS feeds by appending the cat IDs to the feed URL.
I took the feature down as it was causing some overhead issues on the shared server but I am now on a VPS and so was working on implementing it again when I noticed that the feed URLs now no longer appear to work this way.
Is there a way to duplicate this feature again with the new version of WP and does anyone know why this appears to have been removed? Was the change documented anywhere?