I've installed Sabayon on several Thinkpads now, Z60m, Z61p, R40 R52.
Most stuff works out of the box, but some stuff you need to configure a few things.
Like the Ultrabay, which I have working.
There is a fab website dedicated to Thinkpads with Linux http://www.thinkwiki.org/wiki/ThinkWiki
That option is in the KDE control centre is no good, unfortunatly.
As for the dual core issue - did you install the 64 bit version of sabayon? You need this to enable the dual-cores.
If you could be more specific whats not working I might be able to help you out