The following features would help us a lot:
Ability to change milestone or other characteristics of selected tickets, rather than doing this one by one
Ability to change the display order of tickets in Milestone view. We're using Priority, but sometimes we want small tickets to be addressed before others and there is no way to communicate prioritisation of tickets in a milestone to our team. Ideally this is done via click/drag/drop rather than doing it via another priority field with numbers between 1-10.
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