The problem is, you can not have 1,5pxl. 1pxl is 1 pxl. Its the smallest unit. You would need to break down the surrounding pixels alpha value, so that they make in summary the value behind the comma (as transparency). The result would be something like antialiasing and while I am not even sure, that this is technically possible, I have my strong doubts, that this would enhance the dots visibility.
For whatever we may change, its a loose-loose situation, as we cannot provide the same dot size for all resolution/monitor settings, that players might use.
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