Another thing fan films, not just Phase II, but several of them, could do is for a TOS-era film to coordinate two-parters with a TNG era film, or even a ENT-era film to coordinate with a TOS-era film, or even a three parter in which you look at a world develop over time, a la the Lion, the Witch, and the Wardrobe. A ENT era ship visits the pre-warp planet, which makes bad long-term decisions, we then see the issue as it plays out 100 years later, in which the TOS-era ship comes and sees the planet in crisis, and perhaps even a third, short part in which a ship from TNG era, another 100 years later, comes by and sees the smoking remains of a bad choice. The pros never had different ships from different eras producing stories at the same time and couldn't do this... but the fans could!