Mark / Assign task to Technician

Mark / Assign task to Technician

Hello,
 Is there a way to turn off Mark task for Technician?
 There have been times that technician was marked and not Assigned the task. This is raising issue of technician not getting an alert about the task.
We only want this option to be set to Assigned, when techician is selected. We will never want to Mark the task

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