[TheLazySloth]

Putting ShowNameTags(false); under the OnGameModeInit callback would disable the Name Tag above the player's heads... but will not remove their name from the tabs list.

Putting SetPlayerName(playerid, TheRoleplayName); somewhere in your script will change the name tag and the tabbed name... but will not disable them.

There is no way for disabling the names in the tabbed list.

Edit: Hmmm... It shouldn't, where did you put it?