@HugoSon: yes, I noticed improved snappiness too but I had also moved back some relocated directories from /home to rootfs (using unmoveroot.sh). not sure whether it is due to the kernel.

It may be possible to upgrade to PR1.2 without deinstalling kernel-power.
Are there any volunteers from UK (i.e. with OTA access) who could test whether it works?
Warning: make a backup before PR upgrades and be prepared to reflash!
After the installation you would only need to run
or upgrade to the latest kernel version.