This is a known issue with the Android TV integration and won’t be fixed until they implement a remote entity in addition the current media player entity.
There is a branch for this feature in the core api repo on GitHub (GitHub - unfoldedcircle/core-api: API specifications for Remote Two/3 by Unfolded Circle · GitHub). If this branch gets merged it will be available in the next update. But this also needs the integration to use the new logic.
Keep in mind that repeating a command already works by not mapping anything to the same button for long press. But this has a hard coded inter-command delay that might be a bit to long for some devices to have the same speed as with the original remote.
Sorry, I’m a little confused. Is the long press “faster method” possible or something by making changes to the core API?? Or are we still just waiting for this to be implemented eventually into the Android TV integration?