[sirinsidiator]

I am moving this to a different forum since what you ask for is already possible.

In order to assign an item to a quickslot, you can't use

SelectSlotAbility *protected* (*luaindex* _abilityIndex_, *luaindex* _slotIndex_)

Items are not abilities, so instead you need to use

SelectSlotItem *protected* (*integer* _bagId_, *integer* _bagSlotId_, *luaindex* _slotIndex_)

The quickslot indices also do not go from 1 to QSB.ButtonMaxCount. They are in the same space as the action bar slots and start at 9. But you do not need to know the actual numbers. Instead you can use the ACTION_BAR_FIRST_UTILITY_BAR_SLOT and ACTION_BAR_UTILITY_BAR_SIZE constants.

So what you want to do is the following:

for i = ACTION_BAR_FIRST_UTILITY_BAR_SLOT + 1, ACTION_BAR_FIRST_UTILITY_BAR_SLOT + ACTION_BAR_UTILITY_BAR_SIZE do
    CallSecureProtected("ClearSlot", i)
    CallSecureProtected("SelectSlotItem", bagId, slotId, i)
end