My only two major wishes for TFA would be for the Starkiller Base to be completely redone in terms of destroying systems.
I mean, to suck a sun into an ice planet only to fire it in 5 distinct beams to blow apart 5 different planets is not only silly, but ridiculous - even for Star Wars ‘science’.
Why couldn’t they simply fire a hyperspace beam weapon into a targeted system’s star, that causes the sun to shrink and nova? The ensuing blast would wipe out all the planets in the system achieving the same effect cinematically - without the incredulity of repurposing the Mars Attacks nuke sucker effect. A shrinking gas giant that nova’s wold be pretty impressive and set itself apart from the Death Stars (see 2010 - The Year We Make Contact for how that idea works).
My second wish is to have Captain Phasma be the bad-ass with the electrified Tonfa going at it with Finn on Takodana. That would have firmly cemented her as numero-two bad-ass in this sequel trilogy ala Fett. Rather than Han blast her backwards as he did that FN trooper, I would have had her shot in the shoulder by Han and then have her use a another device in her armor to perhaps create a blinding flash so she could cover Kylo Ren’s escape with Rey. Nursing an injury I think that would have also helped out with the plausible reason she could not resist Finn and Han on the base when she was forced to lower the shields.
It’s a mind’s eye wish because that is not going to happen in a fan film, but those two things would have made the movie perfect.