When I read the thread title, my answer was a very clear concise unambiguous "no".
However, after reading what is actually being asked, I say "sure, why not". However, there is ripe room for abuse and any grey area easily puts you in the areas of being wrong. This is akin to pulling over to the curb, leaving the engine running. As soon as you put the car in park, you wear out your welcome. If I need to do a touch & go, I don't even tie up generally. I'm just there to drop off and go, and I mean right now. Anything more, get a transient slip.
I don't even use a slip for this maneuever. Most times I just back the swimstep to within 6 inches of a figer pier and have the person just step off in a leisurely manner. As said, if you need more, get a transient slip, use the dingy or something else reasonable. If you need to get out the lines, then I'd guess that you are taking too much time.
I've often seen people use the "we'll only take a minute" routine and then 30 minutes to 3 hours (really, no kidding) later they are still there, inconveniencing everyone and having that "I don't get it, why are you mad at me?" look on their faces, while perceptably smirking when they think nobody is looking. Good riddance for these "pretend clueless" ilk.
On second thought. No, don't do it. There are too many people in this world who are inconsiderate who will take advantage of this if we so much as think about offering an inch of reason. If you have to ask, you shouldn't do it. Those who understand what being considerate really means will continue to have courtesy priveleges without having to ask because when somebody see's you proactively doing everything you can to inconvenience no one, they often proactively come out and ASK you to tie up to their dock, offering dock carts, and even offering to take you to town in their car. It's really amazing how much grace is offered on the water if you simply handle yourself in a certain manner. It's all in how you present yourself. I'm constantly impressed by most people on the water.
On the other hand, assume, expect or demand somebody elses good graces and plan to be shown the door in a forceful rude and permanent manner. I'm so sick and tired of the "entitled generation" that I look for any excuse to kick these folks wherever and whenever possible. I don't stop harassing them until they have reason to continue their dinner conversation many hours later about "that jerk". I don't just honk the horn, I lay on it continuously until they start howling and I can't help but start smiling. Ya just can't let the entitlement generation get the best of ya.
They are out there. Everyone needs to do their part in ridding the water of a menace much more threatening than zebra mussels, those eel things, that weird seaweed grass they warn against at the boat ramp that came from some ship from Asia or Africa or some other place. No...this is a threat, a danger, greater than any small craft advisory. Yes, the "North American Entitlement Moron (NAEM)" is a real threat. Give them no quarter and inspect your boat often lest you, your boat or marina experience an infestation. They are absolutely terrible to get rid of, seasons are short and you can only use live traps for them. Prevention is key.