Jason,
The tensioner rattle/ tensioner shock that the dealer is referring to is just part the serpentine belt tensioner system, not that of the timing belt. It is an easy and cheap repair/replacement - just had it done myself.
Besides that, I too am anxious to hear the replies to your question re the rails etc., having a 300E and 300TE in the stable, and accumulating lots of kms!
Regards,
Nick