Hey there butchu
been ok with pta for a while, bue there's something I wish to share about my experience.
I like to know which pages refer to mine, but as usually happens after some time you get so many entries in "Sources/Referrers" that it's hard to spot which are new and which are not.
In my case, I am used to visit the links to the referrers, so Firefox shows the visited ones in purple color, and I know that the next time I check the list, if there are any blue links, those are the ones I didn't visit, hence the new referrers.
Obviously it works only on this PC, and only with this browser.
Why don't you use the " - new!" suffix at the end of the links in a smarter way? Like, every referrer is marked as "new" by default, then there's a convenient button (with confirmation dialogue) that, at a chosen time, will mark evey current referrer in the list as "not new anymore" (that is, remove the " - new!" suffix). From that point on, every new referrer will be marked by the new suffix, while the old ones will remain unchanged... until I check the ones that are new and press again the button, at which point all will have the "new" suffix removed and so on.
Don't know how that thing with the suffix works in your code, but in case this function is relatively easy to implement, it may be a tip for the next version.