I tested the new workflow editor that is very promising.
But today, it seams to be impossible to complete an edition using the web editor, because the editor does not support editing all the parameters :

• I cannot delete all of the unconditional conditions that I have created
• I cannot modify the arguments of existing unconditional conditions, validators, conditions or functions
• All the function and condition classes are not available via the editor (Updates change history for an issue, Re-indexes an issue, IssueResolveFunction, FilterCurrentStepCondition, etc...)
• I cannot create, edit or delete global transitions
• I cannot create, edit or delete global post functions
• I cannot change the linked status
• I cannot rename or delete a step of the workflow
• I cannot edit the condition type (AND, OR, etc...)
• I don't know what are the possible meta attributes and what they can do