I'm wondering if we can make a list of items usable for PVP and that are effective for a multiboxer ?

One item is really simple to get, i wonder if the damage still stack, it's the Chained Essence of Eranikus.
https://www.dual-boxing.com/threads/...-Eranikus-x-5-)
https://classic.wowhead.com/item=104...ce-of-eranikus

Obviously, as bomb, we have the goblin saper charge.
https://classic.wowhead.com/item=106...-sapper-charge

Less effective, but only one min cooldown we have the dense dynamite
https://classic.wowhead.com/item=18641/dense-dynamite

Now i'm wondering a lot about the Goblin Mortar :
https://classic.wowhead.com/item=10577/goblin-mortar
You can use this one as gnome eng, but if you are gob eng, you can reload it and it's pretty cheap to do.

But, seems to have a deadzone and a cast time.
I'm wondering if you use an invisiliby potion if you get out of invi when you start to cast or when it fire off.
I'm wondering too if it works as shifted as druid since it's a tricket.