Easy to do, certainly.
Reactions are a way of agreeing with a post, to one degree or another.
It's a way to say: "I agree with what he/she said".
Abused?
I suppose, perhaps.... but I want to keep the option available for the bulk of us who use it for what it's meant for.
Don't you think like...
Plugin features:
A ban to taking back reactions from content. You can set the time during which the reaction can be canceled.
Prevent giving negative reaction if user has less than specified reaction score
Prevent giving reactions to content created BEFORE the user's registration.
Permissions...