Hi awasare2002, welcome to TAI and congrats to your Quanto.
Well it's good to hear that M&M rectified some of your problems.
On the steering and horn issue, yes i too face the same problem when i drive my cousin's scorpio(Scorpio and Quanto shares same steering wheel).Here's how i rectified it: (not sure you might understand, will post the demo when i find time)
So what i suggest is keep your four fingers in between the horn pad and the outer ring, give some pressure with your thumb and the left bottom of your palm you shouldn't find it much difficult.
BTW, please start a separate ownership thread on your Quanto know? It will be nice to hear from you.