These are all very good ideas!
These are the things I would change as well.
  • Remove the Bazaar Modeling feature. People only want to play dress up and it fills the Item Search with ridiculous amounts of items "Not for Sale". (Trying to be polite. ) Change it to a Gear menu that loads stored items on the Retainer. This will keep the option open for those who enjoy it and eliminate the "Not for Sale" items. I don't think this could be any more of a burden to the servers than all the location information currently being saved.
  • Mender's Ward counter. Add an NPC with search menu, sorted by class and repair item, where you can view repair requests. Possibly even offering Common Guild support at the same counter. This will lead to loitering crafters though.
  • Real time viewing of retainers at multiple locations would be the best solution. But just adding a que window, "This retainer is busy at this time and will arrive shortly", with a first come basis would be fine. Players would need priority on their retainers and move to "next in line" to avoid dropping sales.
  • Listing by Character Name. I want to support my friends in game but shouldn't have to know all their retainer's names. By listing Items on sale by player you can choose to support your friends easily. I will gladly pay a higher price for an item if I know the player selling it! Also if/when they implement Signatures on items players can create reputations for themselves.
Keep the ideas coming!