Yes, that can be used as a clunky workaround but doesn't function very well. A big issue is it's 24 hours and no way to delete it... if I used these how I would intend I'd have staging areas at every station by end of the day. I would also have to create a staging area each time I needed one. I could fudge the realism factor and create just a few strategically placed ones (North. South, East, West) but they would need to be refreshed each day. What I would prefer, and would fit the real world is you can send any unit to any station via dispatch not a transfer since its temporary.
This has been asked for before and despite the fact that I agree with you that is a needed feature, I do not feel it will happen anytime soon, if at all. As you said, you could fudge it using the staging area. I have tried it buy just placing the staging area so that it touches the fire station and then I name it "Station 5 Move Up". It seems an extra step and cumbersome but in the end it works and the staging areas don't cost.