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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HaxeFlixel Tutorial: Getting Started
This video describes the general tools of HaxeFlixel software. You will learn about the structure of display list, FlxTexts and changing backgrounds and resolutions in videogames.
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