As far as I can tell, it has never been in DFHack/dfhack (at least, not in 0.34.11-r1, 0.34.11-r3, 0.34.11-r5, 0.40.08-r1, or 0.40.11-r1).
Edit: Falconne's plugins are in this thread, although they were last updated for 0.34.11-r5 - only some of them are included in the official DFHack repo (and I'm not sure if the ones in Falconne's thread contain unmerged changes).
Oh. Is there any reason as to why some plugins were included and not the other ones (namely hotkeys and automelt)? Because they build and run fine on .40.11 for me, I could provide binaries for various OSes if people are interested.
I think just because no one is aware they work, officially or otherwise.
Here's the falconne weighing in that I mentioned above:
Sorry about the lack of updates, I've been busy on some other projects. Will try to get on it soon. I was hoping to wait till the DF updates slowed down.
Here's....you?....asking where to get the source for hotkey (and not getting an answer that I saw):
Unless I'm missing something this plugin is absent in the latest repo for .40.x. Is the source available so we can at least build it ourselves? I find this hotkey plugin very useful and very much miss it in the latest version.