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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Allegorithmic announced a competition for Substance Painter users, promising some cool prizes.
The company specifically says that you are required to use Substance Painter (no other software). Your main task is to paint the model of MAT – company’s new art toy mascot. There’s nothing to model, no UV to unwrap. MAT is already fully modeled and is waiting to come to life with your brushstrokes! Take your (digital) paintbrush, download the MAT model here and start doodling away.
For the newcomers, there’s a 20-minute tutorial, which will help to understand the basics of this software. The new 2.6 release includes the MAT project already set up and ready to paint. Blair Armitage is on the jury panel! You can learn more about the details of the contest here.
And here are the prizes. Some pretty good ones: