Able to delete unconfigured rule + Able to undo 'configure' click (green wheel) [1]
https://trello.com/c/WjoKrpeH

Undo Delete in Rules Editor [1]
https://trello.com/c/gmzWiFQH

Dropdown of rules in rules editing not updating correctly [1]
https://trello.com/c/bZ1itWWo