[FEATURE] Touchpad: separate two finger scroll sensitivity for vertical and horizontal scrolling

[hubleyku]

Scope checklist

• I read SCOPE.md and this request is not in the out of scope list.
• I am not requesting a new tiling layout or a new layout paradigm.
• I checked the documentation and examples/config.toml, and this is not already possible with configuration, window or layer rules, keybinds, submaps, or umbriel msg.
• This needs the compositor. A desktop shell, an ordinary client, or a script over umbriel msg cannot do it.
• I have searched existing issues and pull requests for the same request.
• I understand this can be closed as out of scope, and that this is a decision about the project, not about the idea.

Problem

Touchpad configuration is quite complete at the moment. However, there is one feature that I use in Niri that is not currently available in Umbiel: separate two finger scroll sensitivity for vertical and horizontal scrolling. I set horizontal much higher than vertical for the purposes of quick forward/back gestures.

What you already tried

I have already set the scroll factor to what I like for vertical, but this reduces responsiveness of back/forward gestures on my system.

Area

Input (keyboard, pointer, touch, gestures, IME)

Proposed behavior

I think it would be good to leave the scroll factor that already exists for anyone who doesn't care about separate scroll factors for vertical/horizontal and add in an override for each.

Scope fit

This belongs in the compositor because that's the only way I'm aware of to have this apply consistently across the system. I can't say more than that because I am not a developer, just an enjoyer of the Noctalia stack. Thanks for your work.

Prior art and references

No response

Participation

• I am willing to implement this myself, after the scope is agreed.
• I can test an implementation in my own session.

Additional context

No response