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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Marmoset released a new tutorial video, the 9th part of “Getting to Know Toolbag 3” series, that focuses on custom shaders. Chris Perrella shows how he uses his wizarding ways to uncover the magic of Toolbag’s custom shader system. Follow along as the artist demonstrates the basics of creating a simple shader, and gives some great tips for most advanced effects.
“Getting to Know Toolbag 3” is a series of short video guides that highlights the most important features of Marmoset Toolbag 3. As of now, there are nine episodes on different features: lighting, animation, baking, GI and more. You can find all the episodes here.