Do you mean the settings in my base animation asset? If so would you mind clarifying which settings?
I’m not sure it’s as much a bug report as it is a request for a new feature, to be honest. I’m sure the A+(B+C/2) behaviour has its place and there’s no point drastically changing the behaviour now as I’m sure that would mess with many people’s workflows.
I think what’s needed here is adding skeletal animation as an additive track in the same way that you can set a transform track to be additive.