So, after reading the above success stories I decided that, as a good starting point for 2015, I would install CSSU thumb on my primary device.
I'm at a point where apt-get upgrade doesn't want to do anything (good), but the meta-package mp-fremantle-community-pr is not installed.
If I wanted to install it (which I don't), I would get: busybox-symlinks-procps (wants to remove procps, so no way). community-ssu-enabler (I guess this is the "icon" referred to above) hildon-welcome (don't want it) libcpaboutcssu (what's this?) libqt4-* (unnecessary packages unless something depends on them) maemo-optify-runonce (be gone, and stay there forever) modest-home-applet (don't want it) pulseaudio-esound-compat (don't want it) qtm-maemo-metapackage (as long as noone depends on it, I don't want it).
The only negative effect possibly directly linked to CSSU is that my first alarm this morning stopped after a second or two without me having touched the stop or snooze button. I had experienced this in the past, but not for a long time. I'll keep an eye on it though.
Oh, and for the rotation I had to enable the accelerometer module which I had disabled in MCE a long time ago. Now my desktop rotates. I have to learn how to deactivate that