Yes, setting the default colors from the Options window will affect the background color of form controls, but not the foreground color. This is just how the 3rd party HTML control works, and cannot be changed.
However, there is a workaround:
1. Set the colors in the Options window to the default (blank on white).
2. Open \Explorer Templates\Style.css in Notepad and specify the colors in the "body" style, for example: