It would be nice if this was default behaviour or a plugin was added. You could add a feature request at https://jira.atlassian.com
The way I do this right now is to add the orig estimate column in the issue navigator and move it over near the start. That way a tot up can be done easily enough, see the screenshot on https://answers.atlassian.com/questions/88372/sum-of-original-estimate-in-issues-by-filter
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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