I checked and fixed all postrm scripts in my kernel-power git repo. After uninstalling all packages from HAM (expect kernel-power-flasher with name "Linux kernel for power user") will also remove all config files.

Package kernel-power-flasher will be possible to uninstall only via menu entry "Nokia kernel" (Before it was "Deinstall kernel-"). This will downlaod original Nokia kernel, flash it and then remove kernel-power-flasher packages (+run autoremove).