That's indeed a nifty place for the ultimate description, and I absolutely love how it updates damage. Some more things I've noticed while reading through there though:
- The movement reduction from Cane of the Ancient only shows up in the detailed view, but in the quick view it does not show the speed being halved.
- The Burn/Freeze/Shock passives from wands should probably also show up in the passives tab.
- Some artefacts (e.g. Poison Vial) don't have their passives shown either.
And just as an inspiration, you could also track lifetime damage, healing, and ultimates fired, as well as lifetime CC inflicted. Don't overwork yourself though with all those awesome updates you keep coming.