A legacy cargo hold would be at the top of my wish list.
Shorten some of the gathering mission times when you hit 450. Doesn't have to be a lot, but anything would feel like an achievement bonus.
Fix the arbitrary nature of the gathering mission levels. All grades should have moderate - rich level missions, with chance to crit on the top two levels, or at least make it consistent if nothing else.
Sounds silly and nit-picky, but some sort of reference regarding the top tier schematics for each crafting skill would be nice - what's available, how to get them. etc... As a casual player having this information accessible in-game would be really helpful.
In the crazy ideas that will never happen department, how about letting your toon craft items? Depending on your skill level there could be a slightly higher chance to crit.