Hey, pretty much in the title. I was aware that you were adding this feature, so I decided to post and see if there's any news.

Replay Restrictions has been working since a804d6b (included in *-2.0.0-b3).

Have a look at this gist for a explanation of the protocol. To this date, none of the restrictions listed there are implemented.
To prevent all Replay Mod usage on a server, you can simply set a custom restriction which will cause the mod to refuse to play the replay.

We provide sample Bukkit, Sponge and BungeeCord plugins in ReplayMod/replay-restrictions. No built jar files are available, you'll have to build them yourself.
There is also this 3rd party plugin for CraftBukkit/Spigot which even works with the old ReplayMod 1.0.x versions.

Alright. Thanks