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 free pack that includes 9 unique custom brushes and a default airbrush by Marcin Rubinkowski.
Simply double click on the fill or add in brush panel. All brushes are unset, don’t forget to set brush projection or play with brush options to gain a proper effect.
You can combine brushes from other sets by Marcin to make your own outstanding set.
All brushes where originally made from photos the artist took in Europe, later edited, over-painted, finally tested by Marcin and a couple of other artists.