It appears that $pref::server::TotalRPG::preferredNotificationMode does not change where the currency messages output to. Although, I would much rather appreciate a message on the bottom print HUD, displaying something like "Item/Currency/KeyItem + #" for X amount of seconds after being received.
For context: If I wanted players to receive a small amount of currency (but rapidly) it spams the chat. Although making the pref effect the currency as well as RPG items would be nice, it would interfere with the center print ammo that the weapons I'm using create... So a bottom print would be ideal as an addition to the HUD.
Edit: Another thing, when you receive an item that starts with a vowel, it should say "an" not "a". Something else that could be fixed with just "Item +1" on the HUD.
Edit2: Similarly, if you had your currency as something like Dollars, when you receive 1 it would say "1 Dollars". Perhaps an option to add an 's' onto the currency name for quantities bigger than 1 or just the "Item +1" HUD thing.