[Drajor]

Did you use the method written out by jdoran to do this or did you simply edit something in eqstr_us.txt? I tried adding this code

Neither. See EntityList::zoneWho, specifically;

if (ClientEntry->IsTrader())
	WAPP2->RankMSGID = 12315;
else if (ClientEntry->IsBuyer())
	WAPP2->RankMSGID = 6056;
else if (ClientEntry->Admin() >= 10)
	WAPP2->RankMSGID = 12312;
else
	WAPP2->RankMSGID = 0xFFFFFFFF;

The RankMSGID corresponds to a string ID from eqstr_us.txt. You could add more conditions there for detecting an item or whatever. If you check the hard coded IDs currently in use you find;

12315 TRADER
6056 BUYER
12312 * GM *

Based on my limited tests you can use any valid string ID. Note that this only applies to local zone who, not who all which happens in different place.