Aggregate info such as DPS is not supported yet, because our item API does not support getting the base information yet.
For example, there's no way to know the base damage, APS, or other intrinsic properties of items if they are not stats. The only item where we had added that info was Flasks.
This will be added in the future, but in terms of API updates, API map support is being worked on now, then we'll work on item stuff and other missing things, like support for choosing the bandit to kill/help, and better support for working with the NPC gui windows for things like quest rewards.