Blend Modes on the Smugde Tool
Description of the feature
With 'Blend Modes' capability is possible to think on Smudge tool also as Paintbrush, Pencil and Airbrush Tool. Provide the option to use blend on the smudge tool increase the possibilities to emulate interesting techniques on GIMP, for instance, 'impasto'.
As comment 6 on the original Bugzilla report says the developer (Shark0r) of the new features on smudge tool about my suggestion:
Blend modes enabled as other paint tools. I have studied it. It's difficult to implement because smudge tool calculates brush-to-drawable blending by itself, and doesn't use common approach of other brush tools. This may have benefits but needs many works. May need to reconstruct smudge tool's engine.