Wes Anderson would never allow the camera to pan while tracking.. At least not anything else than 90 or 180 degrees.
1. Biggest psychological barrier is perfectionism. Although sometimes a very good trait, several projects, which could have been finished by now, are still in pre-production.
2. I am anxious when directing somthing that is going to have VFX done later in the process - am I shooting it right? Will the VFX blend in?
3. Not really an issue.
4. I want to follow a director on-set doing his thing. How does he adress the actors? How does he cope with all the challenges?