I know this question is a little old, but "better late than never"?
Anyway,
pageeventvar1 should be the "link type"
There are three types of links in Adobe:
- Other / lnk_o - this is your custom links
- Exits / lnk_e - this is exit links
- Downloads / lnk_d - this is downloads (based on links with specific file extensions)
pageeventvar1 and pageeventvar2 work together, so you should be able to use this in conjunction to isolate exit links only.