Andrea, 1- If when creating an auto keyframes range, we have the "create curve
type" already set to bump (because it remembers it from the previous time) and then we go directly to the "create keyframes" phase, the autos that are formed are not bump type. In this case we have to transform them manually via RMB and choose "bump". However, I noticed that this setting is not automatically transmitted to the corresponding autos in the other tracks. In short, "gang mode" does not work. This is very boring if we have a lot of tracks because we have to intervene manually on every single keyframe of the interval in the timeline. In any case, when we want to create a bump autos interval, just remember to click on "create curve type --> bump" even if it is already preset. This way, in my tests, it always works well.
So far we have been unable to reproduce the stated interval problem but I will continue to try tomorrow. Only the Speed auto needs a "gang mode" - the rest are irrelevant. GG is thinking about putting a checkbox on Speed to enable gang mode to avoid all of the extra work.
2- If we create a bump autos interval and vary their value with the slider, everything works fine. However, if we change these values a second time (always with the slider), the problem returns that the created interval does not change according to the edits. Sometimes it works, sometimes it doesn't.
I have not been able to create this either but will try again tomorrow.