Yes, I find myself trying to select "points" on the overview tab. And I find myself wanting to see more interesting info in the tooltip.

Yep that's a very good point.

The Overview panel would be extremely well suited for the task of selecting a number of projects for comparing them.

So what you are saying, this could be a way to multi select experiments for detailed comparison (i.e. selecting the "dots" on the overview graph), is this what you had in mind?