How can I transfer fastest times and winning streaks etc, from a previous install (from LM9 to LM10 say)? Seems a shame to loose my progress every time I upgrade. Particularly kpat statistics at the moment.

In fact, some kind of map of which files get which config setting would be really useful. Some system settings become unset, I find.

If you keep your home directory (located under /home) in particular the ~/.kde4 folder, then your achievements will be transferred without issue.