You could only do that in dry conditions unless you wanted to flood your van from water on the hose, plus it would get on the workings of the reel and possibly cause problems with connections.
With a remote and auto spoiling reel Your Mayb going to save 20 seconds per job tops.
Waterworks reels reel 100 meters in 30 seconds. Just walk back to the van, grab a cloth, and hit he button. your on your way in seconds. A spooling reel is complicating things too much I think.