Beta 8 bring some small incremental updates to better support addons, and two major changes:

1. The Siege and Assault features have been moved to the Movecraft-Warfare addon. Currently the Movecraft-Warfare addon is feature equal to those removed from Movecraft, but in the near future we are planning on greatly expanding the feature set as used on the Airship Pirates server. In addition, we will be rolling out Movecraft-Repair and later Movecraft-WorldGuard to replace the functionality within core movecraft (and allow more flexibility to use Movecraft without dependencies such as WorldGuard and WorldEdit).
2. @eirik1996 has added Gearshifts! These can be activated by shift right clicking with the pilot tool while not in direct control mode. You can activate this per-craft by setting the gearShifts option in their type file to an integer more than one (e.g. 2). By default they slow down the cruise speed of the craft, but they can be configured to adjust the skip blocks or direct movement as well (documentation coming soon).