[KLS]

He's right, here's some very simple code demonstrating the concept:

void command_optest(Client *c, const Seperator *sep)
{
	if(sep->IsNumber(1))
	{
		switch(atoi(sep->arg[1]))
		{
			case 1:
				{
					const ItemInst* inst = c->GetInv().GetItem(29);
					if(inst)
					{
						uint32 slot_id = atoi(sep->arg[2]);
						if(slot_id >= 400 && slot_id <= 404)
						{
							c->SendItemPacket(slot_id, inst, ItemPacketTributeItem);
						}
					}
				}
				break;
			default:
			{		
				break;
			}
		}
	}
}

Makes the client gain the stats of the item in your lower right inventory slot without equiping it. It's somewhat complicated in terms of a client hack but in theory yes it could certainly work.