Use Item Tutorial
Use ItemQuickly switching to a hotbar slot, using the item in it, then switching back to your weapon or original slot all sounds very tedious. I would say it sounds like it is able to be automated. Now introducing Use Item, the one stop solution for (almost) all of your hotbar needs. In the future, this module will be expanded into a fully featured macro system, but for now users are stuck with the default items.
Usage Bind an item conditional to a key (CTRL+ left click, then press a key). The default mode for the item conditionals are already set to "When held", so don't bother changing them. To use a hotbar item, press the key you bound it to. Make sure the module is enabled. Switch Delay The applied delay before switching slots.