Please add a text-field for "Project Number" for each project.
This would help a lot when creating reports.
Ok, we're using TMetric integrated with other Issue trackers, e.g. Trac, and the Project name is automatically set from the Trac project name when I'm starting a task from there.
When I'm reporting time to my employer I need to keep track on which unique projectnumber my time entries belong to. These project number often changes while the Trac project name is still the same, so I can't integrate the project number into the Project name.
Instead I'd like a separate field for each project that holds the current projectnumber. That means I can extract time reports that could easily be imported directly into our company's ERP-system.
I hope this explains my wish for additional the field.
Another application is that usually customers have internal project ID that is required in invoices and monthly time sheets.
It is not seldom that you work on multiple projects simultaneously. For example one project is development, another - support and maintenance. Or there may be region-specific projects (like, for example, localized software delivery to the US, Japan and Brazil).
Any way, it would be usefull if you give us dedicated field that would be visible in reports.
BTW, it is possible to adapt tags for this matter, but it is not that easy to manage them when number of projects grows.