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Description
Is your feature request related to a problem? Please describe.
I'm trying to do pixel-level annotations. However, the smallest brush size seems to be too big. 
Describe the solution you'd like
Smallest brush size is pixel-level.
Describe alternatives you've considered
I've tried setting strokeWidth=1 in the corresponding Label tag (shown above) but this doesn't seem to fix. It looks like the width is double the width of a pixel, but it's ambiguous because of the rounded corners. Would like to get more clarification on this.
Setting strokeWidth=0.5 also doesn't seem to work (see image below). I had to click 4 times to get this result, which makes me think the brush width is half a pixel, but again, unsure because of the rounded corners.
