If you're already using Adjust to do it manually, no, but you did add Post Liked and Post Reacted events. One option would be to award credits based on meeting a minimum number of reaction points. Makes me wonder... On an older vB forum, we had a Reputation system. Regular users could give each other +1 Rep for good posts, but by default, if a Moderator gave reputation, it was +10 (and I believe that number could be modified). I'm skimming settings in XF2, and it doesn't look like this is an option natively, but if there was a way to make a particular reaction worth x points limited to moderators/admins, you could created a Reacted event tied to that reaction. That would be visible on the post, but lack comments.
You could also just do it manually as it stands, and have the moderator reply, or maybe use one of the "Post Comment" add-ons to add a note below the post.
Just ideas, but they'd require outside add-ons. Unless you disabled Reactions entirely for the average user and only let moderators react, then you could use the Reacted event with no worries of users abusing it.