Hardness Setting in Brush and Clone Stamp Tools

[khatfull]

Description This is currently the one thing I miss from Windows-based paint.net, the hardness slider in the clone stamp and brush tools. I used these settings a LOT during retouching.

Any chance of adding the paint.net style hardness setting to these tools? It's much akin to the tolerance setting in other tools, not too bad to implement hopefully?

Thanks.