I'm not sure if this will ever be possible, but I know that it would greatly benefit me and I'm sure thousands of other users. In my work place I am constantly working in a conference room and at my desk. At my desk I am wired into an Ethernet connection while in the conference room I am wireless. When I start my workflows after working with my team in the conference room, I can't go back to my desk until the workflow is finished running because I am changing internet connections and I lose connection to the databases. With the pause button it would become possible to run a workflow and then change my internet without losing connection to the databases.
Another use for this would be while testing a workflow with a new tool. There are times I run a workflow that can take a few hours, but then I realize there is a mistake somewhere in my workflow, where the data hasn't reached yet. I think it would be very helpful to be able to pause the workflow and add the new tool in, while seeing results from tools it has already passed through.
But yet again this is just an idea that relates to me, I wonder what the rest of the community thinks.