Hi Taron - you can 'stipple' with the brush.
It doesn't work so well with a tablet because you end up moving a few pixels every time you tap the brush. But with a mouse you can get great stippling with the oil brush.
See the attached image.
If you take the loading of the oil brush down very low, and the thinners up a bit (feel free to experiment with both of those!) you can use the mouse to dab the brush.
It's possible to do with a tablet as well, but requires very steady hands.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"