I'm not sure I've fully understood the messages written in French, but regarding Treetopflyer post, I'd like to say a couple of things.
Firstly, I don't know about French DGAC, but the Spanish one has imposed a maximum daily of 4 flying hours (up to 5 in exceptional circumstances). Almost all Spanish aircraft have two pilots for this type of flight to be able to stay in the air more time.
My experience of two seasons fishing is a maximum of 60º bank angle (high enough) and, of course, to be or not to be near the stall depends on your IAS.
Certainly, some observers are more agressive than others (I've had the two types), but there is when the pilot in command must make the right decisions and do wathever he/she considers safe.
We do communicate in 123.45 saying our call-sign, altitude and altimeter setting. When in the vecinity of other aircrafts the one which arrives the latest must climb 100 feet higher than the other. I must also say, that not everybody does this.
Finally, all flying jobs have their portion of danger. I personally do some crop-spraying which I consider more dangerous than the mayority, but the job has to be done and the solution is to put in place as many safety nets as possible. Troubles start when we relax and think the job is easy.
Have you all good and safe flights.