Jaggy,
I am still in the process of getting my PR, so I cannot answer most of your questions regarding landing. However, regarding number #11, from what I see, looks like your wife was on H-4 while the application was being processed and now she is on H-1 and you want to know whether to re-enter US on H-4 or H-1 after landing....Well, since she already got her H-1 approved, H-4 is automatically void...There is no choice here, she has to re-enter on H-1...So she might need a visa to re-enter...Note that this is just my opinion..You should talk to a qualified professional regarding this...
Good Luck.