i dont use traffic trade scripts, i only trade hard links with my own sites, and im not real sure what all the usual features are but...
heres one that you might want to look at
http://www.smarterscripts.com/intellilink/pro.shtml
it has a few anti cheat features that are kind of interresting and a few other things i thought were kinda cool. its pretty cheap but may still be good.
rl