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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MilkShape 3D has all basic operations like select, move, rotate, scale, extrude, turn edge, subdivide, among many others. MilkShape 3D also allows low-level editing with the vertex and face tool. Standard and extended primitives such as spheres, boxes, and cylinders are available. Milkshape 3D can export to over 70 file formats.
MilkShape 3D is a skeletal animator. As well as supporting its own file-format, Milkshape 3D is able to export to morph target animation like the ones in the Quake model formats or to export to skeletal animations like Half-Life, Genesis3D, Unreal, etc. The number of file types that the program can support features all major 3D game engines from Source, to Unreal, to id Tech, to Lithtech. It has become known as a useful converter from one format to another.