Actually it is possible. I do not know if it is possible in this script, but generally it is possible.
I actually know a couple sites that have a feature like this. It's really nice to have because then you can know which of your advertisements are successful or not in promoting a referral link.
For example, Clixsense has a feature like this which I don't think most member know about. It's something like campaigns where one appends their referral link with a "&"
my cheesy example: h**p://www.someurllink.com/somereferrer=whatever
&somePTPadThe bold in my example is what is appended to the example link.
This works really well for PTSU ads.