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If I have been keeping track of the riders here who have switched to 140 sizes of rear tires, many have went to 140/70 vs 140/80 but you're not the first to put an 140/80 on the rear. There should be no rideability issues that you can't overcome by using the taller tire. Although, if you didn't like the flickability with the stock tire, then this one shouldn't change that aspect of the bike in the direction your wanting to go with the stock front. The net result of your setup now is you have effectively raised the rear of the bike while leaving the front height stock. This is something racers do to INCREASE the flick rate of the bike. We consider it an improvement along with the added rotating mass in the rear (heavier tire) helps with mid corner stability when you want 60% of the total bike/rider weight on the rear tire.
Keep riding it... if you like it, then there is no issue. Otherwise, you know you need to come down in rear height.
Also, as far as fitment and how close it is to the swingarm. There "should" be no big deal with that either, but don't be surprised if you get the tire pretty warm and pick up a rock that gets wedged in between the tire and swingarm. It may make a pretty nasty scraping sound as the tire rolls at very slow speeds or pushing the bike. It may never happen though, due to how the swingarm is designed. The big thing to watch for is odd looking wear lines down the center of the tire. If you see this, check to ensure the tire is not rubbing the swingarm.
For your wheel... If the shop damaged the paint on your wheel, THEY should fix it. And NOT with nail polish either. If it's just paint damage, then you can get a colorrite pen. If they scratched/gouged it, then that will have to be repaired and you can get some colorrite touch up paint for that area.
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