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.
check my website for the latest tips - always updating with new content!
Steve Loiselle is collecting free, high-quality materials, static meshes, textures, special effects, audio packs and other stuff form various authors for UE4 projects. Tons of free goodies to build your own scenes, in one place!
Most assets in this page are uploaded to my GoogleDrive. If available, click on (DL) to download the asset. I also provide a link so you can post your comments on a forum (Thread) or at the author site (Website). All assets from my GoogleDrive are compress with 7-Zip and password free. Just unzip the archive and voilà! To learn how to import assets in your project, go at UE Wiki.
Take a look at some of the collected pieces:
Basspixel 6 dark textures pack (4K) (DL)
Basspixel 6 dusty particle textures pack (4K) (DL)