I use Paint Shop Pro. When I use text, the drop down font size menu only allows down to a certain point or pixel size (generally down to 6). But I'm able to type any other number into the box (like 2) and get a result. You may have to adjust your line widths and anti-aliasing to make the letters legible.
BTW, that paint is looking good! Keep it up
EDIT: I just installed paint.net and fiddled with the fonts. Yes, it looks like 8 is the smallest you can select from the drop menu. But typing a number in the font size box allow you to go down to 1.
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