Support hyper-linking one task to another or Precedence / Dependence
The idea is allowing me to link one task to another by clicking on a hyperlink and / or keyboard shortcut. This would allow tasks or ideas to be in different parts of the tree structure but to still be linked together easily. This is a great way to show a preceding task or a dependent task.
You can get HTML link for a task by hovering date timestamp Actually, usual HTML hyperlinks should work.
Also, you can use syntax
[link: text|URL] and take task’s URL by hovering last update link in show details mode.
For more usable approach, please vote for http://checkvist.uservoice.com/forums/2121-general/suggestions/1045559-easy-linking-to-existing-lists-and-tasks