The precise pencil setting in ArtRage 2.5, and the airbrush tool both work as digital artists expect.
Note that in the Real World <tm> you also cannot see the exact stroke you've made until you lift your tool as the stroke is obscured by the tool head.
The technology behind the natural media look and feel of ArtRage has limitations with regard to making the stroke appear precisely on the tool head while you're working.
If you prefer a more digital look then use the airbrush and precise pencil.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"