I also noticed this behavior change and find it very annoying. It makes me reach for the mouse when I don't want and never get used to it.
As far as I can tell, there is no way to restore the previous behavior, and I suspect that this is indeed a regression in the IDE. One of the reinforcements for this point of view is that it was used for the RTL / VCL modules, and, of course, I do not need to tell the IDE where to find them.
If no one comes up with a solution, I think it should be reported to Quality Central.
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