The other question I had was about the tilt-to-angle mapping itself. The "tilt outline" cursor maps well to my tilt. But the brush itself seems to be off... not sure if it maps 360° to 180°, or the other way around, or if there's a stray ABS in there that turns negatives to positives, or what. But tilting down seems to be 90° off from tilting up whereas 180° would be expected.

Yep!

I tried changing

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        else if (m_settings->moirepattern) {
            m_hatchingBrush->hatch(m_hatchedDab, x, y, sw, sh, spinAngle((m_settings->crosshatchingsensorvalue) * 180), painter()->paintColor(), additionalScale);
            donotbasehatch = true;
        }

to

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        else if (m_settings->moirepattern) {
            m_hatchingBrush->hatch(m_hatchedDab, x, y, sw, sh, spinAngle((m_settings->crosshatchingsensorvalue) * 360), painter()->paintColor(), additionalScale);
            donotbasehatch = true;
        }

in kis_hatching_paintop.cpp and recompiled it and tested it and that fixed it! I'll make a patch once I've fixed the other thing I really wanted to fix (adding an angle parameter).

(Devs: If I forget to do that or die or something then feel free to make the change based on this post. We don't really need a patch to just change two characters♥)

Edit: This also makes the "Drawing angle", work better (but don't combine it with tilt direction, use one or the other). It was working weirdly before.