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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Did you attend GDC 2018? What was the most memorable session? This one, for example, was quite awesome. Check out a recording of a talk by Guerrilla Games’ Eric Boltjes on the game design of Horizon Zero Dawn. Learn how the team turned a paper concept into one of the biggest games of 2017.
In this 2018 GDC talk, Guerrilla Games’ Eric Boltjes gives insight into the journey Horizon Zero Dawn’s game design went through while moving from an ambitious paper concept to a finished open-world action RPG, with all of the small and large design decisions and choices that have to be made along the way.
Make sure to have a look at the GDC channel on YouTube for more talks from the conference.