Well I have a weird answer for you…
While searching for answers about this very issue, I came across a post / forum reply / something (it’s been long enough now for me to forget the exact location but I feel like it wast Github) where someone was asking for something similar to the hook of mycred and wp-polls. Lester has been working on updated versions of the plugin and depositing them there. So, I uninstalled official version and installed the one from there. This new version has this hook built-in. It worked great. But then I was having some other various issues, as the code for the Gist version is not completely updated and it wasn’t keeping my questions and answers properly, but was adding points via mycred for polls.
I asked him when he’d make the official release of the plugin and he said not til the new release of WP, which looks to be mid-to-late August. So, I decided to uninstall the Github version, so I could at least have the polling functionality – so I could work on writing pre-release poll questions etc. til the update.
So I uninstalled it and re-installed the official version.
BUT…interestingly enough…the hook stayed!!!
So that is a round-about answer but it’s what I did. ??
Update: Looks like here’s the Github: WP-Polls