Support project-specific Lead Time and Cycle Time definitions
In order to make Lead Time and Cycle Time really useful for any given project, it should be possible for the project manager(s) to configure the board columns where the measurement should start and end.
This configuration should be made in the "Modify Process" area and NOT as something that can be configured when viewing the metric charts.
The following blog illustrates quite well why this idea makes sense: http://blog.brodzinski.com/2010/05/kanban-measuring-lead-time.html

Hi Rodolfo,
We have now added a capability to select the Start/ End date and view the lead/cycle time accordingly.
Request you to give it a try and let us know if this meets your requirement or if you have any further suggestions on this.
Appreciate your valuable input. Thanks again for choosing SwiftKanban.
Thanks,
SwiftKanban Team