What I don't consider a good approach is excusing behavior that's disruptive or disordered or distressing on the grounds that the child is gifted.
I agree. In our case, we never "excused" anything.  I read lots of books, and used a lot of 'strategies'.  She received an IEP (based on ADHD diagnosis) and support and services at school.  A lot of people have worked really hard (especially me!) to help her; it's just impossible to know what would have happened otherwise.  
There are two things that we chose not do:
1.  Pay out of pocket for any assessments or services.
2.  Put her on any medications.  
I'm not saying that these are bad; I know that many people have gotten good results from private consultations and/or medication.  I'm only sharing my personal experience.