Warning: long post ahead!
thank you very much for that (I thought you were behind it = : D). Will see if I can do a flight during the weekend.
@AndreasAntener again about Acro mode, I can agree with you if we speak about a fixed wing. A fixed wing does not require attitude lock because it has aerodynamics helping on that side, e.g. static margin, dihedral etc. But did you ever try to fly a fixed wing with a negative static margin or a negative dihedral? A plane with tail becomes crazy, but the pilot could eventually still control it and do crazy aerobatics. Not very comfortable though! A tailless plane becomes unflyable by its nature, but it still has a little bit of help by aerodynamics. I was able once to land a plank with a completely wrong CG and therefore negative static margin.
I guess a multirotor without attitude lock can be compared to a fixed wing (better a plank) with a negative static margin and negative dihedral. It does not stop rotation, but continues it forcing the pilot to counteract all the time.
As an example imagine doing a 4/4 roll: with a fixed wing, with aerobatics settings, say very neutral static margin and dihedral set to zero, the pilot has to roll and stop four times, without any couteract (I'm not speaking of pitch control!). The plane will stop rotation when the pilot stop the roll input. I expect the same from an aerobatic multirotor, but I guess without attitude lock it will become impossible.
Is there around anyone flying a multirotor in Acro mode (I mean flying not levitate = : D), any video?
Sorry to be long, but am trying to be clear in what I mean.