I've added such an option just out of curiosity, compare https://tools.wmflabs.org/erwin85/xcontribs.php?user=PiRSquared17 and https://tools.wmflabs.org/erwin85/xcontribs.php?user=PiRSquared17&logs=true . It takes about 10 seconds more in the worst case (~700 wikis to check), which is better than I expected (thanks to the logging_userindex table).
However, log counts come with their own set of issues, in particular the fact that there is a bias towards certain wikis with higher logging (like interwiki userrights changes on Meta-Wiki, autopatrolled on wikis with patrolled edits). Is this feature worthwhile enough? If so, we can add a checkbox to make it clearly available.