It is quite surprising that this feature is still missed in ProjectLink. Microsoft, Enovia, Primavera, HP HPPM... have all Timesheet capabilities.
When ProjectLink tasks have assigned resources and project is open, people need capability to add daily effort in their tasks and daily summary to check all work has been reported.
Timesheet capabilities are essential for Finance Departments to calculate project costs.This enforces best practice that users track their work in ProjectLink and report work already done and better resource planning
Finally it is a good idea that user can also close tasks from timesheet reporting screen.
In order to efficiently work with this feature non-manual planning in ProjecLink should be also improved, because now ProjectLink show tasks for users even precedent tasks are not still finished. If this is not also improved in ProjectLinks users might see tasks which are not ready to work.