1. Enable upgrading of the Branch office. Each additional level adds the posibility of another simultaneous trade offer.
2. Rankings. Some type of ranking system that tracks yearly, monthly and weekly statistics about various feats. Most xp gained, most bread produced, most value gained from trade. Different tables for non-gem buyers. Just a leaderboard of some kind with various stats could be interesting to browse.
Adding another here instead of starting a new thread
3. A button at the trade interface that resends the previous offer.