• Maximum Fees can be set on the "Settings" page -> "Adjust fee limits". Looking at the current orderbook, you can actually send a collaborative transaction without paying maker fees, as some offer their liquidity fro free. But of course, you'll always pay the miner fees (which is higher than for non-privacy enhanced transactions, as you have multiple inputs/outputs).
  • See https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/master/docs/fidelity-bonds.md#what-amount-of-bitcoins-to-lock-up-and-for-how-long
  • Switch from being a maker to being a taker sometimes
  • Jam still seems to be in beta phase, devs generally like feedback - so if you want to help the community: Report bugs, ask questions, improve the documentation, add feature requests, etc.