Thanks for the quick answer.
1.) Yes, there are thousands of dots in each font file so the dot-by-dot scaling would be way too labor intensive.
2.) Yes, I have to scale every single dots to 10% without moving them. In Adobe Illustrator there is a command "Scale each" (?) which does that, but I don't know how could I do this with a font file.
I wouldn't mind purchasing the Font Creator but I don't have time, patience (and knowledge) to scale all the dots in about 40-50 font files. If there would be a batch process, or a "copy out - scale down - copy back" type of action that would help a lot. (I am afraid there is none.)