I have been wishing for this option for years and now, after some genius thought to ruin the Timer page to show only the current weeks entries, I once again would love to have this.
On the Reports page, please add an option to time entries in Summary and Detailed view to “Continue time entry” (you know, the little arrow on the Timer page after each time entry).
I don’t know about anyone else but that’s how I mostly use Toggl. I simply continue existing time entries so that my entry names stay consistent. And this option would be a big help.