Measuring habits and streaks

So, personally I am loving Omnifocus-3.

the flexibility as a result of tagging is incredible.
For example - we can now use tags and completed perspective. Which for me - is in someways more useful than reviews.

However, want I want is an easy way to validate the consistency in which I hit certain tasks. Being that part of GTD is seeing habits and measuring them - i’d like an easy way to measure the percentage I hit a specific task or challenge or group of challenges I’ve set myself as habits.

I could do something like an export to calculate it - but this doesn’t seem easy or elegant either.

Any thoughts from the community?