Currently when you are testing a workflow, if you get an error or a workflow stage fails, you need to restart the full workflow. When we have Approximately 30 Tasks, with forms, and then the associalted workflow processes, this is a painful thing to test. I would be good to be able to fix the issue and restart that test workflow from where it failed with the fix in place.
Added to this would be more assistance with testing the workflow too - a view to see a progress line throught the workflow diagram (making the connection lines green for success, and the action boxes green when successfully processed, and red where it fails. And the ability to see what the values in all the variables are from the testing screen.