No, this isn’t a hunter addon.. though I suppose hunters could use it :).
Multishot is a tiny little addon that automatically takes screenshots for you when certain events happen. You can open the config by hitting ESC and choosing Interface, then the Addon tab. As you can see by my config** (which I’m pretty sure is the default out-of-the-box config). It can take screenshots when you levelup, get an achievement, or when a boss dies either in a dungeon or in a raid.
It does very well capturing the levelup moment.. and the achievements.. but it’s hit/miss on boss deaths. It seems to catch about 90% of them.
** and yes, I will admit it.. I have a lot of addons installed. Whatever.