Here is what the author has to say;
This is basically what it does:
Select throw
-very small delay... (probably isn't even needed)
Select fc skill
-small delay...
attack - farcast usually happens here
As said in any guide, it needs to be one quick motion. Far less than a second, except for the delay after the switch back to your fc skill, but even that delay is very short.
I included the source, it's very basic autoit I'm not a expert but I know enough to get by.
It's fully configurable with your trigger key and the 2 delays. Change what you like (except for the F1/F2 hotkeys, deal with it )
Everything else is in the readme. Enjoy.
I have scanned the file, it is clean, the ban status is unknown, use at your own risk!