Can you explain more about this rainbow table function? From what I understand, rainbow tables are simply precomputed hashes of common passwords. What you're saying is that we should use passwords that aren't in a rainbow table, which by definition implies that the passwords are not common.
Rainbow tables are a clever way to implement a time/space trade-off for finding the inverse of a hash value in general by doing a lot of precalculation (see wikipedia, the core nice idea there is explained under "hash chains" in the Rainbow Table page).
Besides, rainbow tables are supposed to be pointless because everyone's supposed to be using salt with their passwords...
