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 a recording of a Unity live training session by Matthew Schell that shows the process of setting up a custom character controller. Take some time to study this 8-part video guide and create a character controller for a 2D platform game which uses custom physics instead of Unity’s built-in 2D Physics.
You can find more details on the live training session here.