Hi Marina,
The reason of my worries is because when we read the documentation, one of the first notes we found is:
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Enabling Event monitoring
Event monitoring is disabled by default because of performance issues. An administrator can enable it from Site administration>Reports>Event monitoring rules.
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So, I think it is normal that questions arise like: to what kind of "performance issues" are we exposed? (mi first post)... and, are these issues being resolved? That's what I meant when I asked if there are any plans to improve this new feature, I searched at the tracker and I didn't found any issue related to the performance problems.
I don't think it will be a good practice to select between more than 5000 teachers, one by one, to give or not the capability.
Thanks again.