As far as I know such a level simply doesn't exist. You either have a higher risk of overcharging or higher risk of premature termination. With the usual level there is probably non-negligible risk of both. Except the false positives or negatives the sensitivity doesn't change the moment of termination in any important way. The -dV overcharges the cells - if you apply the trickle charge afterwards they will be even more overcharged.
... and I'm suggesting it doesn't necessarily overcharge, because they use a conservative termination with the idea that yes, it's a little undercharged, will finish charging with the trickle.
dT/dt is not based on the temperature value but on the detection of the temperature rise rate. Please read the descriptions of appropriate algorithms if you are interested in comparing them.
... but this is even worse, in aforementioned example the 90% charged battery temp rise is much faster than the other. I am still of the opinion that dT is not so good unless only comparing two cells going through the majority of a charge cycle, and with similar impedance else you again have different temp rise.
You may be right but the documents I read claim that it would be more costly to implement it correctly than to have a simple -dV. I tend to believe they are right here.
I can believe it is more costly to implement "correctly" because it would need a microprocessor to factor for several things in addition to just temperature change, like the amount of time and rate vs cell size. This is one of the reasons I feel Delta -V is at present still the reasonable method to use, but the higher the charge rate, the more important the charger have a safety temperature cutoff circuit, emergency type not just typical end-of-charge detection type. Often a circuit like this is quite simple, simply a resettable thermal breaker in series with the charging contact and of course as close to the battery tube as reasonably possible.
I understand your position and sometimes it is more appropriate also for me. Nevertheless I am interested in finding out what are the results of using various available charging methods. Especially since there seems to be a popular impression that there exist a single best method that can be recommended to everyone and I think it is simply not true.
I think the best method is the most convenient one, that will vary per the situation.