Go facebook plugin notification problem

Hi, im using go sms pro and the facebook plugin for it on my DROID pro. I can set individual incoming text alerts for select contacts for sms, but I can't seem to do the same for the incoming facebook chat messages, even though they all show up in the go sms pro list. This is driving me nuts; the functionality is already part of the program, why can't I set individual ringtones for facebook chat!?

Sent from my DROID PRO using DroidForums

One of the benefits of Go SMS Pro is the ability to set custom notifications for individual contacts. Can it be that nobody using the facebook chat plugin has ever tried to set one for a contact there? The option appears ("notifications"), but when you select it the menu simply disappears, returning you to the conversation without presenting any options...