I've been doing little flying in the last few months and that's about to change.  A few questions, if I may.
1.  Is there a place where there's suggestions for fine tuning of the controls?  I thought I'd seen it some months back but can't find it now.

2.  The manual is pretty brief in the Appendix describing the Intelligent flight mode options.  Anyone done anything more detailed?

1) DJI-TIM is the master of all things DJI (Thanks TIM!) Look for his posts first on the topic HERE.
You may be thinking of his MC Settings Tutorial.
Dundee has a video link here about adjusting Expos & Gains . Be patient, takes a while to load...

2) Two places explain the IOC functions pretty well:
Phantom Videos, click on load more and find the IOC videos.
Sploodge's P3 Ground Station Functions

terrylewis Posted at 2016-1-21 19:58
1) DJI-TIM is the master of all things DJI (Thanks TIM!) Look for his posts first on the topic HERE. ...

Thanks, Terry.