you guys are mixing things up ..
the referral system is there already and READY TO GO ..
what you will not be able to do right now is: you refere to openledger.info with r=foobar and get credited for the referer ..
that simply is not yet implemented since it needs to be done in a separated backend ..
//edit: and btw .. that is an **voluntary** feature of the exchange (e.g. openledger)