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The ability to add columns to the left of the timeline. Things like assignees to tasks and a completed button would make a world of difference.
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Click on the day of the week to add a new row and that rows start date is automatically set to the day you clicked on.
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Blackout dates like the weekend so that tasks don’t count days people are off. It would also be nice to link to a table to reference so that it can dynamically blackout dates based on your schedule or data.
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Ability to drag dependency lines with anchor points on the front and back of tasks.
There are a lot of really expensive software out there that can be completely replaced with these Gantt chart features.