I don't know whether this is a bigger job than I imagine, or whether many people would even appreciate it...
My filter list has to have a number prefix in-front of each one, so that the appear in the order I want.
It looks kind of dweebly, and the numbers also appear in the tabs, which is kind of fuggly.
It would be cool to be able to reorder them by drag and drop (or other means), and be able to delete the numbers.
Not a big deal by any means, though.