Karabiner parity: mouse axis manipulation (mouse_basic)

[malpern]

Summary

Karabiner-Elements supports mouse_basic manipulator type for flipping, swapping, and discarding mouse axes (e.g., invert scroll direction, swap X/Y axes). Kanata has no equivalent.

Karabiner Features

• flip: Invert mouse X, Y, vertical_wheel, horizontal_wheel axes
• swap: Swap XY axes or wheel axes
• discard: Suppress specific mouse axes entirely

Current State

• Kanata: Not supported — no mouse axis manipulation
• KeyPath: Not supported
• Karabiner converter: Rules using mouse_basic are flagged as unconvertible (Tier 3)

Impact

Very niche. Primarily used for accessibility and specialized pointing device configurations.

Related

• Tracking issue: Tracking: 100% Karabiner conversion fidelity roadmap #213
• Feature matrix: docs/karabiner-converter-feature-matrix.md