Add the ability in the distance dimensioning to be able to report the width of an O ring groove between two circles.
I can see some pitfalls with this, especially if the circles aren't concentric...
(CIR1.DIAM-CIR2.DIAM)/2 would give you the width of the groove regardless of the position of the circles, but if you are certain they are concentric, then sure.
A function like this could be dangerous, depending on (knowledge of) the operator using it.
Then again, diameter + concentric evaluation combined into one function could give you a max/min type of (calculated) distance (discarding roundness of the diameters).
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