Recently I've seen a topic on the openxcom forum about a feature that I wished was in the game and it actually was implemented for a long time. Capped stat being marked as a different color, it's just that by default capped stat was set to same color as base one so it didn't work.
You can go to your openxcom folder and navigate to standard>xcom1>interfaces.rul move to line 1561 or search for type:solderinfo line and replace id:numbers color2: 208 to something else, I don't know exactly how these numbers and colors work but 218 appears to be blue and it looks distinct enough.