Can I apply adjustment status for my spouse?

You may petition for your spouse as a LPR at this time. Consult with an attorney for guidance.

Would there be any questions related to my detention during visa interview or during port of entry?

Yes there will likely be questions related to this at time of interview.

Best to wait until the new administration takes over although unlikely.

Yes you will no longer be eligible for the fiance visa if you marry.

If I want to refile another petition from another wife did I have to put my previous wedding evidence with it ?

With the previous history, it is best to be prepared for questions surrounding marriage.

It appears you will need a cosignor so best to file accordingly.

I came to US on student visa and married to US citizen so do I have to leave US after filing I-30?

You may file for adjustment of status directly having entered with a student visa. Consult with an attorney for guidance.

Crewman with I-130 approved and I-485 denied?

Unfortunately you are not eligible to adjust status with your entry as a crewman.

What is the step after you've been denied a green card, American spouse is sponsor?

You may refile your application at this time. Consult with an attorney for guidance.

Yes they may remain after their I94 expiry while the petition is pending.