It is not currently possible to move a stage or a step in the workflow designer.
It would be useful to be able to move a stage or a step in your Workflow. For example, your business logic has changed or you might just want to update the order of the execution steps/stages.
I would like to click on a step, drag it and drop it elsewhere in my Workflow and click save instead of recreating that step and deleting the older one.
I guess one of the workaround (never tried it before) would be to manually change the XML of that Worfklow, but it would then require a "skilled" developer. This is not necessary something that your customer can easily do.