Luckily, I typically play in the evenings when my home course isn't crowded, and it's very likely if you run into me, I'll be playing 2, sometimes 3 balls by myself.
I've had people come up behind me and I let them play through and they're happy. I've come up on groups of 3 or 4 who offer to let me play through and I decline and tell them that I'm practicing and hitting multiple balls, so I'm perfectly fine staying behind them and not feeling rushed and being able to hit multiple balls. The course staff (pro and greenskeeper) come out and talk to me as I'm walking and hitting multiple balls and never said anything about it at all, so obviously they don't mind as long as pace of place isn't effected. At that time of day, they're usually carrying a club or two and are out practicing as they make their rounds as well.
As long as pace of play isn't effected, I don't think I would care about someone hitting multiple balls if they were right on the guys in front of them, and if I'm not recording a round for handicap purposes, I'd be likely to do the same right behind them. People tend to get very impatient on the golf course, but it does no good to clear the green quickly only to catch the next group while they're still teeing off and sit and wait and complain again about waiting, which is usually what happens.
I've had problems with a particular 200 yard Par 3 on my course finding the right club for different pin/tee box placements, so I'll sit and hit 5 or 6 balls into the green sometimes. If I see someone coming up behind me, I'll walk up, pick up the balls, repair my ball marks and then move into the trees where I'm out of the way for them to play through me without waiting even a minute and then sometimes I'll head back to the tee box and hit them again. My home course is far from a goat track, but as long as I take care of the course and don't just sit and dig trenches and leave them, the grounds staff is perfectly happy. In fact, I will usually fix multiple pitch marks that aren't mine and fill multiple divots that aren't mine as I'm walking by.