Enable Administrators to Query User Database

As a Confluence administrator I would like to easily search through my user database based on a number of factors. Some of these could include:

• Last login date (e.g., show me all users who haven't logged in in 180 days).
• People who are a member of one group but not another (e.g., who is in "QA" but not "UK-QA").
• List all users who can access a specified space (i.e., by virtue of being a member of a certain group which has permission).

Ideally I'd like some sort of way running a query string against the user database. I used to be able to do this using a user macro but since my user base has grown to nearly 2000 users, the operation times out before completion (in any case, a search like this was very inefficient, often taking minutes).

Finally, if possible, I'd then like the ability to perform bulk operations on the results but that's probably a whole different request.