In general, extension works as expected on Flarum 1.8.5.
Its seems very native but not implemented for now: delete reaction from some user. E.g. sometimes users set "Pile of Poo" or "thumbs-down" emoji on Rules. Cause it some sort of disapproval action I decide to delete this user and reaction is gone (this cant help if unregistered users reacts). But more correct is temporary block and delete this reaction manually. It can be done with cancel-crosshair near username in list of reactions. Also it needs separate permission.
I cant delete reactions or restrict some reactions for some posts in any way, but it is not votes and sometimes its unacceptable.
Correct me if I miss something and show me some donate-way for boosting this feature-request.