I would like to see it mostly to consolidate the actions/rules in expansions. A good example would be a section on titles, modifications, etc. Put in the errata for cloaking, as well as things like segnors loop, et all.

I would really like all the expansion missions under one roof, in like a missions supplement (with reference to which expansions have what tokens required )

Also rules for huge ships with errata under the main rules as well.

Pretty much this - compile all existing rules into one rules booklet, and all scenario/mission rules into one missions booklet.