I am trying to use the company I work for's color scheme in the maps that I am making. I have all the RGB values for the colors, but there are only 10 different shades of each color, while the style manager's ramps need 12 shades. Is there any way to change the number of colors in each color ramp?
According to the arcobjects documentation it looks like you're stuck with 13 colors ...
However, looking at the COM categories, it would appear that you might be able to roll your own colorramp, by implementing IColorRamp and the others that the PresetColorRamp coclass implements. You'd also need to write a propertypage class that implements the same interfaces as the PresetColorRampPropertyPage coclass.