See clip from Attorney Rajiv S. Khanna's conference call video that addresses this question.
Filing for two benefits for eg: H-4 and F-2 or F-1 or even H-1 becomes problamatic when there is a change of status involved. So if you are applying for two different statuses at the same time that becomes problematic. If on the other hand your status is H-1 - the same status one is in the amendment mode, the other one is in the extension mode I don’t see it as a problem. Whether your amendment gets done first or your extension gets done later or the other way round I do not see how that makes a difference as long as your statuses is being maintained. I do not see any problem with having simultaneous filing of H-1 amendment and extension. There is no question of the application of the last action rule really doesn’t matter. If the amendment comes before the extension or transfer comes before the extension it is your choice you can stick with the same employer and join the new employer later when the approval comes. Last action rule has little bearing on this.
Regarding question four what the government has said is we will not do premium processing where you request an extension whether the extension is with the same employer or with a new employer. So extension cases will not be processed in premium processing until the government says otherwise.