First off, I wanna say that this is the best e621 tool there is.
Second off, let me say that this will save you a lot of time and will drastically improve your e621 experience.
Now, what I initially wanted to do with it was that I wanted to bind my mouse's macros to actions like Fav/Upvote (for obvious reasons) and it helped me do it like a charm. I totally recommend this tool in case you're wondering.
Updated by furrypickle