That's OK - my apologize if it looked like I was demanding it.
We could come up with a method to determine if a copter has met the requirements for that. Due to ecalc and a few posts that I've read (don't remember where - probably on diydrones) I used to believe that my drone was able to handle motor failures. It wasn't. Now, it seems that it is close to it, but @lvcosh raised important considerations about the method I'm testing.
I'm volunteering myself to help writing a wiki page about it, but we should understand well how those variables work ( possible side effects etc) . Since Leonard has closed the issue probably the code is able to handle the failure. If that's true, so, detection is a plus but the wiki page will be needed.
My guess is the default parameters should work with powerful copters with mot_thst_hover < .20, but It may be possible with tuning to get it working for setups around .30.