I have two questions for ya (apologies if it's just the same question phrased in two different ways):
1.) Nothing from the UI. It can be done via database update but you cannot do that from the cloud. So I guess you have no choice here but to use the "Resolved Date".
2.) Velocity Charts are intended for Sprints (in the Scrum Board), and not for Kanban. The closest thing you can get is the Control Chart (https://confluence.atlassian.com/display/AGILE/Viewing+the+Control+Chart)
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