My suggestions for anyone making a fanedit of Solo:
Insert the deleted scene of Qi'ra and Han jumping into a vat of eels. We see Qi'ra outthink Han, which helps me believe her survival skills later in the movie. The intimate moment reveals more emotional connection than the slightly rushed affection in the early part of the movie, which helps me get emotionally invested in their bond.
Insert the deleted scene at the Naval Academy. It's not perfect, but it explains how Han goes from enlisting in the navy to getting into the infantry. It also confirms Han's attitude to authority. This was the only part in the theatrical release where I felt that Ron Howard cut out an entire scene. Turns out that feeling was correct!
Improve the music (I know, easier said than done). The music was the biggest disappointment for me in Solo. The score has new Solo music, some Rogue One references, and a few Star Wars snippets. What disappointed me is that the transitions are too abrupt and the SW and R1 inserts too short. It doesn't help that the Solo music lacks the emotional power of SW or even R1, which makes the inserts all the more jarring for how abrupt they start and end. So, for anyone who has great musical editing skills: please lengthen the SW and R1 references, maybe add a few more, and smooth out their transitions.
All in all, I enjoyed Solo and think Ron Howard and the actors did a commendable job. While unnecessary for this movie, I didn't even mind Maul: I appreciate that this affirms another interesting snippet from the SW cartoon universe into the SW movie universe.