What do you think about having a spectrum instead of just black and white for color selection?

If you mean you could pick a color for the unit (font) display per Player Color (which I think is what you're saying, just making sure I understand), then I could see it going with tom's proposal of allowing map designers to pick unit font size.
Of course I think it could potentially look horrible too if the map designer was careless, too much color on a map starts to look confusing and messy (I was/am worried a bit about this with my Mario map).

You can make something look bad no matter what, but options to make something look good shouldn't be repressed because they look bad. I do completely agree, though, that it could look awful. I would like to see it mainly for teams, where you could have the green team all be the same color with different colored unit counts.

I think it could be pretty cool for theming a map - a different font and background color for the numbers could look very cool - e.g. courier and a light green background would give it an old school computing feel.

fonts and colors open a lot of doors. Could you vary the font sizes to standardize size? Since many fonts vary in what 12 pt means.

Yes I think that would have to be in there as well.

Yes, please make things like color choices more complicated for me.

Ha - it's the one aspect of mapmaking I'm actually good at.

I think it could be cool to make a game where your font and font color are different, but the colors are the same... you could do some fun stuff with that and the dual layer mode. Like a completed sudoku where everybody is white with different fonts. The sudoku begins completed with each person getting one of each number or something. I think that could be really cool. Maybe the player names in the stat box can be in the same font as your number so it's clear who is who.

What about tilted/resized numbers? Then you could put numbers on sides of buildings, add perspective, etc.

I assume the easiest way to do that would be to allow you to stretch the territory, and the number comes with it... but it doesn't sound very easy.