I had wanted something similar; which is a "configuration safe upgrade"; this can be combined with the other things that you mention. But, note that even securi

I had wanted something similar; which is a "configuration safe upgrade"; this can be combined with the other things that you mention. But, note that even security features can cause problems if they are not what the user wanted. It is appropriate to get rid of buffer overflows and other stuff like that, but to disable some feature because it is sometimes considered as "insecure" can be bad if the user cannot configure this.