Peter, I'm using fixed ISO (I set it myself) I know about the auto function, but right now I'm trying to keep everything as manual as possible so I get to know the camera better. When I get it all sorted out then I plan to take advantage of the A B buttons and also some of the other auto features like the ISO one you mentioned.
I plan to keep working on the different focus modes, but right now all I can say is that I prefer what I've been using all along which is single point AFS. I'm probably expecting too much, or picking the wrong type of subjects to track but so far I'm not happy with AFC, AFA, 3D whether it be single point 9 point or 39 point. It will take time and experience for me to know which one to use where, but for now I do a better job tracking a subject myself.
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The squirrels have been quiet latley, but they will be back. I can see the point of picking a spot and pre-focusing manually and then waiting for the subject to go to that spot, especially with all the tree branches at all different distances that the camera wants to lock on to. It will take some practice and time and patience but I think I'll get it before the year is over.
Wendy