The features include:
- sequential downloading on macOS (Based on @midenok's work transmission-patches)
- ETA badge for macOS Dock
- Click on the icon of the torrent you want to download sequentially.
- Check the Download Sequentially checkbox from the pop-up menu.
Alternatively you can enable it by:
- Right-click on the torrent you want to download sequentially.
- Select the Options tab (Gear icon) in the Torrent Inspector window.
- Check the Download Sequentially checkbox on the Options tab.
The progress bar of the selected torrent will turn to orange.