If a user clicks on a link on a search page, stays a few seconds on the new page and then press 'back', and clicks on another link on the search, that's a pretty strong signal to Google that the first link wasn't that good.
Hmmm. If true, I wonder if cmd-clicking the top N links into other tabs can be distinguished or if it's harmful for their ranking. Also, does going back cause a reload?
I'd guess that various clicks in a small time frame can be trivially detected and discarded as noise. The vast majority of the users do not use that pattern.
I don't think it causes a reload, but it can also be trivially detected using JavaScript.