Hi DesuDeus, you could use a standalone color picker and then only use the standard Windows one that MoI currently uses to enter in the R G B values.

You might also be able to find something that hooks into the system and replaces the standard colorpicker, but I don't know of anything like that offhand myself.

Maybe try these Modo discussion threads:
http://forums.luxology.com/discussion/topic.aspx?id=35744
http://forums.luxology.com/discussion/topic.aspx?id=7276

At some point I'll probably make a custom made better color picker but it just has not been a priority yet.

- Michael