I end up cloning a lot and have learned to grow the list from the bottom up but mistakes hurt hard!
The only way to rectify is to delete (down to your omission) and build back up. I find a messy list makes admin very tiresome so this is a big deal for me.
Alternatively, if you don't fancy adding yet more interactive web wondery could we get access to the underlying configs?
I'd care less about the lists shortcomings if I could edit some JSON/yaml or whatever and makes things right again :)