[sirinsidiator]

Sounds good. If you ever get to change the menu system, maybe you could also make it a bit easier for addons to change the behavior of an existing entry.

In the current system this is the simplest way I could come up with to change the primary action of the craft bag item actions for AGS' direct selling feature

local oAddSlotAction = ZO_InventorySlotActions.AddSlotAction
 
local currentInventorySlot
ZO_PreHook("ZO_InventorySlot_DiscoverSlotActionsFromActionList", function(inventorySlot, slotActions) currentInventorySlot = inventorySlot end)
 
-- prepare AddSlotAction in order to redirect the action
ZO_InventorySlotActions.AddSlotAction = function(slotActions, actionStringId, actionCallback, actionType, visibilityFunction, options)
    if(actionStringId == SI_ITEM_ACTION_REMOVE_ITEMS_FROM_CRAFT_BAG and TRADING_HOUSE:IsAtTradingHouse()) then
        if(self:IsItemAlreadyBeingPosted(currentInventorySlot)) then
            actionStringId = SI_TRADING_HOUSE_REMOVE_PENDING_POST
            actionCallback = function()
                self:ClearPendingItem()
                ZO_InventorySlot_OnMouseEnter(currentInventorySlot)
            end
        else
            actionStringId = SI_TRADING_HOUSE_ADD_ITEM_TO_LISTING
            actionCallback = function() TryInitiatingItemPost(currentInventorySlot) end
        end
        actionType = "primary"
    end
    oAddSlotAction(slotActions, actionStringId, actionCallback, actionType, visibilityFunction, options)
end