I would ask you an important question: how can I end a workflow without pressing "task done" button?
When I click on "approve" (i.e. in the review-approve workflow) I wish the automatic ending of the task (and workflow) without pressing any button….Is it possible??
The complicated answer: You could hack into the JSF-pages that handles the workflow for you and make some changes there so that it triggers "task-done" without the need for pressing the button.
Perhaps you could create your own workflow and write a webscript-interface to it that behaves the way you like. The "standard ui" of Alfresco really isn't made for that kind of changes.