you could do it through a weak aura with the following:
Display Type: Doesn't matter, recommended TEXT or ICON.
Custom Trigger Event(s): PARTY_LOOT_METHOD_CHANGED, PLAYER_ENTERING_WORLD
I added some redundant events to check for to make sure you don't have the aura NOT fire for some reason and potentially screwing you out of gear. Nothing that would be a performance hog, though.
Code:
Custom Trigger:
function()
local _,_,lootMethod = GetLootMethod()
if lootMethod == "master"
then return true
else return false
end
end
Custom Untrigger:
function()
local _,_,lootMethod = GetLootMethod()
if lootMethod == "master"
then return false
else return true
end
end