I think Rewind has the ability to be an extremely good feature on Lunar Client, but after I convinced some of my friends to try it out, they've found a lot of things that they really don't like with Lunar Client and Rewind that could easily be added or fixed for all users.
Rewind's main competition is Flashback. Both offer cinematic tools for content creators, but there are aspects of Flashback that are crucial to many creators that can't be found in Rewind. I asked one of my friends who uses Lunar to tell me a list of things he didn't like about Rewind:
• Keyframing is a lot more annoying in Rewind than it is in Flashback.
• You can't change a player's skin or nametag in Rewind.
• You can't give people the glowing effort as you can in Flashback.
• Whenever you change the time of day in Rewind, half the sky will still be in day time.
• Overall, it feels like a bulkier version of Flashback that's missing some of the important features that make Flashback so good.
On top of all that, you can't even use Flashback with Lunar Client. Some people who I've suggested to try out Lunar have left shortly after due to the absence of these important aspects that are otherwise only found in Flashback.
I suggest you add these features to Rewind or at the very least east allow Flashback compatability with Lunar Client.