Sorry, I should probably provide a description of how I'm specifically intending to use this add-on.
Basically another forum asked me to host a long time member who they were no longer able to host.
The particular member has a hobby of posting a great deal of porn images and also has a surprising number of loyal followers.
I do not run a porn forum, I run a free speech forum, however I'm not going to stand in these guys way because that would be hypocritical of me. So I've set them up a private subcategory forum only they can access & view.
Unfortunately these 50+ members only ever login to perv at/download porn images and don't bother doing anything else, not even reacting to posts, and so far they have simply ignored all my attempts at communication. And I mean, I'm not running a pervert charity & do not tolerate lurkers either so I expect at least some basic degree of interactivity by all members.
I've already tried several passive options to encourage these members voluntary interaction—but without any success yet.
Thus, since they ignore passive encouragement, therefore I've little options available other than to try forcefully encouraging them and this 'Like/reply to view attachments' add-on seems to be a potential solution.