I was planning on doing this for the wiki. Another thing I’m planning on doing for the wiki skill maps is making icons for for certain skill effects (increased CD, increased Damage, added damage type, etc) and allowing those icons to show up next to the skill node with a filter to show/hide each group. I was also thinking of a colored underlay to show “groupings” of nodes (e.g. on summon skeleton there could be groups for the Archer, the warrior, the mage, etc).
Base damage numbers would be useful. I’m not sure about the ARPG genre, but for other RPGs and MOBAs it is weird to have almost all base damage come from the weapon (as opposed to the skills). Some way to show this would be great, even if it’s just a “Melee Attack Damage Before Modifiers” stat in the UI.
Health numbers on health bars would be nice (although i’d like more detailed Target stats as well).
Lastly affix and implicit ranges are impossible to find, but I can’t really think of a good way to incorporate them into the UI. Potentially having the possible rolls shown on the comparison tooltip could work (for implicits anyways).