Support of multiple tasks on a single line is yet not available for the Gantt widget. That is why, I would recommend you to log that idea as a Feature request on our Feedback portal.
Based on the support it receives, we will decide on whether to proceed with its implementation or not.
As per customizing the Task template to fit into your needs, that could be a viable approach, unless you have to move
the inner parts of the task. Therefore, I could suggest you to disable those two editing modes for the Gantt.
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