If USCIS so wishes, they can certainly make an issue of it. But they tend to be much more tolerant of cases of immediate family like parents and spouse.
Adjustment of Status
Here is a commonly encountered situation for AOS applicants (I-485 pending) from our clients-only extranet:
If he entered legally and is not subject to any other bars, and if you are a US citizen, he can apply for AOS when applying for his green card through marriage to you.
Generally speaking, where there is a choice, we always file multiple green card applications for spouses.
If your priority date is current, you can file her AOS as long as she is legally in the US. I just have an issue with using F-1 visa to accomplish this purpose. Please consult with a lawyer about the details.
I think you will be fine. As I recall, the law only requires you to get married within 90 days. But confirm this information and do check with a lawyer as to whether you may travel or not while AOS is pending. This could be the only issue I can think of.
It looks like you have several options. Once 180 days of AOS pendency are over after I-140 approval, usually employers cannot hurt you. Speak with a lawyer.
A1. As I see it, the wife will be out of status right away and unlawfully present if USCIS revokes her H-4 or her I-94 expires.
1. An EAD is good to work on US soil only. If you wish to work in a third country, you have to look to their laws for work permissions. You should file an AC21 portability and make sure during your entire stay abroad you have at least your Advance Parole; preferable both your AP and H-1 visa.
2. As long as the permanent job continues to exist, there is no other requirement of presence.
3. I see no problem with visiting USA as often as you like.
1. Theoretically, you can work for as many companies as you like on EAD. My concern would be the implication that you no longer have a full time job with the sponsoring company, which is a requirement for the green card.
2. Since you are on a derivative EAD, you have even more freedom than the primary applicant. Other than an S corporation (I think that requires green card under tax laws), you can form any kind of corporation (LLC, etc.), but do check on the State law.