Hello, thank you for your feedback. There is auto weight less than 100% when there is multiple bones (https://docs.pixelover.io/tutorials/mesh_deformation) but indeed maybe it's not very adapted to control a face at the moment, I'll check if it's possible to reproduce your tutorial video else I'll see what should be fixed. (maybe depth displacement would be more easy to use to rotate a face ? https://x.com/deakcor/status/1695134254101905561)
But adding a track a key automatically I'm not sure it's a good idea, because it will create a lot of tracks not used, because yes most of the images will not use any animation as they are already attached to animated bones. And after it can be really a mess because if you begin to setup your animation and you move an image under a bone (because the image wasn't well placed for example) and you don't know that the software automatically created a keyframe, you will now have an animation of your image moving while you just wanted to replace it.
But yes thank you again for your feedback, I'm agree there are points to improve in the mesh setup and animation I'll see to improve that.