We do not currently offer an add-on, extension or integration with Apple Final Cut Pro X. 

We've looked at doing this in FCPX. Unfortunately, Apple doesn't provide an option to import markers (like Media Composer) or an option to create an Add-on that sits inside the program (like our Premiere Pro panel). 

The work around would be to create an application that you would have to install on your Mac. To import feedback into a project you would have to export the XML from Final Cut, open it up inside the Screenlight application. The app would then merge the feedback with the project file. Finally, you would have to open up the new revised project file. 

The barrier to doing this isn't technical, it's mostly that the process feels like it would be cumbersome and there's always risk when making changes to people's project files. All this isn't to say that we won't do something with Final Cut (we'd love to offer the same features for everyone), it just means that we're waiting for feedback from you. 

Who knows, maybe Apple will respond to us about a better way to do this ;)