RSS: Select some, but not all, feeds in favourites

[mkvf]

Currently the favourities tab of the RSS feeds preferences allows you to "choose what feed you want the filter to apply to; either all of them or a specific one". I often want to use more than one feed, but not all of them - could the drop down be changed to work in the same way as the "qulaity" drop down, letting the user select as many, or as few, feeds as they want?

[Vectorferret]

I like this. Don't need it, yet... but could very easily see myself using it if it was there.