A recent release of our employee timesheet software Timesheets Lite added the ability for some users to edit other employee timesheets. Above you can see a screenshot of the employee timesheet with the employee timesheet dropdown highlighted in red.
If the logged in employee is a super user (see here for a discussion on employee security levels in Timesheets Lite) then they'll be able to select other employees names from the dropdown. When another employee is selected their timesheet data will be displayed. That data can then me added to, edited, or deleted exactly the same as the employee's own data. The task timer cannot be used to record time for another employee. This is the only real restriction on working with another employees data.