Thank you for approaching us.
Visibility of Weekly view to the admin is not currently implemented. But we do have plans to provide Security for Timesheet module and have included this in our roadmap.
About having "Export to Excel" in monthly view; this is a really good idea from you. We will also include this in our Future Enhancements.
Meanwhile, if you have any other issues, Please feel free to communicate with us. We are happy to help.
Happy Using Ganib!