<p>Stanford has actually cautioned against sending supplementary materials, recommendations etc. They have advised against it.</p>
<p>I agree with Pea that their is no decision really in the case of OP. The OP has decided to go on the wait list and should hope for the best and plan for the worst. </p>
<p>In our case (as was discussed in the detail in the parent thread), we are concerned that if he goes on the W/L and then does not get it, he will be very disappointed. If he does go on the W/L and gets in, we will visit then. </p>
<p>Meanwhile he has to make a choice with what he has and we need to spend time visiting the choices he has, not the ones he does not. In our case we do not see the utility of spending time and money visiting Northern California only for visiting Stanford, when the outcomes are unknown.</p>
<p>In case of the OP, he/she is visiting UC Berkeley anyway and hence it may not be too much extra trouble. I would still advice against a visit to Stanford for the OP but I can understand OP doing that, given that he/she is already there.</p>