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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Umbra: 2015 Games Showreel
An overview of videogames created with Umbra tech and released in 2015. Umbra provides graphics technology middleware utilized in a lot of modern videogames. These include Call Of Duty: Advanced Warfare, Killzone Shadowfall and Destiny.
© Umbra’s channel, 2015, https://www.youtube.com/channel/UCljhaJ8S_98_pGeOVbNee5A