Alt click on a node connection automatically disconnect it from the other nodes. And there is some nodes which can be easily summoned by pressing a key and clicking at the same time. Like B+click will place a branch, and S+click a sequence.
If you're willing to compile it, Aseprite is a great option as well.
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DICE 2015: Creating Call of Duty Zombies (Mark Lamia, Treyarch)
The head of Treyarch studio, Mark Lamia, discusses the history of adding zombies to the popular first person shooter series Call of Duty.