Just to add to Susanne's comment, you could create a filter based on this jql query:
assignee = benediktb and resolution = Unresolved and timespent = 0
which returns all open issues assigned to benediktb where there has no work been done. You can than view that filter in the Advanced Timesheet in Tempo.
You can also return all issues assigned to any member in a team: https://tempoplugin.jira.com/wiki/display/TEMPO076/Tempo+JQL+Functions
I don't think you can do anything similar regarding planned hours, I am afraid.
By changing the settings for "Users allowed to register time into future" in the Tempo Global configuration you will get the Plan Time Pop-up Dialog when you choose a date further in the future than the "allowed" setting and a Project. To plan time for an issue you have to choose the "Plan time" button above the time sheet.
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