Well, the data is certainly already being pulled. For example, when I look at a thread for my mod every reply has whether the user has my mod installed, and what version. So it's just a matter of adding a couple variables in a hook and a template mod to present them.
As for the unique across all mods stat, again, the data is already being pulled. The total installs for each of my mods and my total overall installs in listed on my profile page. At worst it would be a matter of adding an additional join or where clause to an exiting query, which is how the original data is getting pulled out anyway.
In short, none of the requested stats should require any new queries or have any impact of server load. They would of course require a minimum amount of hook coding and some small template edits.
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