It would be great to have the ability to set values dynamically for variables before displaying them in the "Start" form of a workflow.

Here is an exemple: I want to set the default approver for an item according to a metadata of my document (lets say the service) before dispaying the start form.
Doing so, the user thatr initaites the workflow just has to
- check if the default value is correct
- launch the wokflow.

No need to set the variable= better user experience + less errors risk!