Well, it's very simple. Where ever you stick the $totalviews, just put the text by that. For example, if you put it in your forumhome template, so it's below your total threads and total posts, as I did, like this:
Code:
<b>$totalviews</b> total thread views
You could just change it to this:
Code:
<b>$totalviews</b> total thread views since May 7, 2001
(Or use whatever date it was when you converted from UBB to vB.)