thanks for the usual interest.I don't think that's possible. the color, among other things the object of discussions and polemics in the passage to 2016 in which they became white/blue instead of yellow/green, are studied to make the icons immediately accessible.
These icons I suppose are present in an internal solid database.
How do you want to change colors? replacing the type of icon with a created by you? no clicking on it and changing color how do you do with sketches? could be a system and icons with double color? you could change only the currently yellow partand would you manually change dozens of icons? I would do so to the creation/input of the particular, among other things the particular trade/freedom would have the color already set.is it not easier to give a color to the component? I already do this, otherwise it would be impossible to work, but I cannot, for example, give the same color to the details of milling, while the icons the same color could have it. I could color all the details of milling on the green scale, turning on the red scale and so on.