Wow DF, great stuff. I need to do some testing!

Pardon me if this is simply restating the obvious here or correct me if I haven't got the concept.

Using this method I should be able to (within certain limits);

1 - Place my exposure based on what is best for my subject on any given film.

2 - Decide how much shadow detail I want in relation to my subject and adjust this with development time.

3 - Decide how much highlight detail I want in relation to my subject and adjust this with agitation.

So, for a back-lit afternoon portrait I could;

1 - set the camera by using an incident reading "under their nose" to place the main subject on the film exactly where it needs to be to print nicely,

2 - then extend or reduce development time a bit to control the details in the bushes behind them, and

3 - enhance or reduce my agitation to control the details in the sky.