As a QField user, it would be very convenient, especially for field work, to be able, when digitizing layers, to enable freehand drawing without specific devices (active pencils and mice), but also allowing capacitive pencils and the same finger.

It is at the discretion of the rest of the community and the developers to determine the most convenient way.

I personally think that the best thing would be to make the most of the existing infrastructure and merely modify the Freehand Draw button in the Digitization mode, adding a small gear to its icon, so that, when you hold it down, it presents your options: a box that unlocks the drawing by hand and a slider that allows you to choose the sensitivity for tracing lines and polygons when tracing across the screen (fewer milliseconds = more vertices, smoother strokes). The latter is somewhat similar to what was requested at https://ideas.qfield.org/app-feature-requests/p/add-option-to-smooth-lines-digitised-using-the-freehand-option. It may not be a bad option to express sensitivity in the selected measurement unit or in pixels either, but saying that is easier than doing it.

Dragging one finger adds vertices due to sensitivity (except in points, leaving only the last position), dragging with two fingers moves the map, pinching with two fingers adjusts the zoom.

As with the rest of the scans, it would not be confirmed until the green tick button was activated, the option to undo the last vertex and the rest of the options is maintained.