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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Check out this talk by Robert Magee on how you can create procedural assets in Houdini that can be loaded into Unreal Engine 4 using the Houdini Engine plugin. Learn how assets can be built in Houdini’s node-based environment and then deployed into the game engine.
Also, make sure to watch other videos dedicated to Houdini tricks here.