More Robust Trello Integration
Specifically, I'd like to be able to sync both ways, from Trello to Gantt, and from Gantt to Trello. I'd love to be able to review my day's tasks in Gantt and then add them to a "Today" list in my Trello board.

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Dddd Ffff commented
Do you mean that the lists from trello show up as task groups in Gantt? or do you mean that Cards created in gantt get sent over to a specific list in Trello?
For now I think the sync is able to happen right now if you enable it through the powerup inside of Trello. The only problem is that when you create a card on Gantt theres no way to select what trello list on the board it goes to. It just defaults to the "first" list on the board.