Customizing Constraint sketchs to different colors then what comes with inventor

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At work, we have Inventor 2016. The graphics don't give us many options to change the colors around. We might be able to get the background to where we like it but then it changes the sketch plane drawing lines.
Right now I have Presentation set in design for colors under application options. The themes are already pre-set.
I have attached what my color scheme is set too. and I have attached a picture of a sketch that shows black and blue line. And I think that the blue is unconstrained but it is so hard to tell. This is very annoying.
So On that note, I was wondering if it is possible to go in and change the unconstrained lines to red. So it really stands out to what needs to be dimensioned. I heard there is a possible add-on that I would need to do this.
Any ideas on how you can help with this one.