Thank you prkos,
I would actually like the

and

tools to not do any interpolation at all (or very little at least). A simpler solution could be giving the user the possibility to enable or disable interpolation (e.g. Inkscape would generate a new node for each pixel the mouse traces).
I'm interested in controlling the interpolation tolerance because I do a lot of handwriting on Inkscape with a Wacom tablet. The interpolation in Inkscape tends to oversimplify my handwriting to the point that it makes some words or letters illegible.
Disabling the interpolation would make

and

tools behave like a free-hand tool in a classic bitmap editor (such as Pain.NET). Adjusting the interpolation would be like setting the CurveFit attribute to 1px or 0px in Adobe Photoshop.
PS: Is there anyway to access any of these (possible hidden) parameters via scripting in Python?
Best,
Amelio