I recently flew my asymetrical in my slip for a while to dry out my sail before packing it away. There's no harm in this if you have a very light wind
abaft and a sturdy dock with no close neighbor, piling or obstruction to snag your sail or sheets
. I also have often run my propulsion engine
at about 1500rpm for a while at my slip at times and without any concern. There's far more strain on my dock and pilings when in setting in the slip in winds over 25 kts with my two mile fetch to the northeast. I like to use a "sock" to put away and deploy my spinnaker so I can handle it more easily by myself. I don't use a pole, but there's a wealth of literature and instruction available. Hopefully, someone will add some good advice for you here.
You might notice the bundle of white fabric
at the head
of this cruising chute. This is the sleeve or "sock" that can be pulled down to make spinaker handling much easier.