From now it is possible to log work for other users for Timesheet Reports and Gadgets app.
First admin should add corresponding groups to configuration setting Log Work For Others Groups on Access tab. Then users from groups above will get possibilities to log work for others at the similar way as for yourself.
For Timesheet report with user selected and without any grouping Log Work buttons and + in cells will be available. To notify logging for others On Behalf of field will be shown at the bottom of Log Work Done dialog / popup.