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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GDC 2015: WebGL Meetup
A video of the 90 minute WebGL meetup at GDC 2015. Learn the biggest news about WebGL 2.0 and the devices that support this technology. This event was attended by Kenneth Russell, (Google) Tony Parisi (Learning WebGL), Cyrille Fauvel (Autodesk), Brandon Jones & Zhenyao Mo (Google), Ross McKegney (Verold) and Jeff Gilbert (Mozilla).