It should obviously not come as a surprise that having areas of the brains working differently can explain an awfull lot of things... but to answer your questio

It should obviously not come as a surprise that having areas of the brains working differently can explain an awfull lot of things... but to answer your question directly, yes of course of course there are! Simply look up all the many, well -supported and -researched known correlations with ADHD first. In the second step, you can construct the set of all possible correlations, and subtract the well-researched ones if it. What is left is the set of correlations that are either not explained by ADHD (the big majority I would assume) or explained by ADHD, but as-of-yet unknowingly so. This might be a bit anticlimatic, but clinical psychology is pretty straightforward study design and statistics, and set theory is not that new either, so... no big surprises I am afraid.