In NY is it legal for an employer to pay travel expense as cash instead of a salary increase?

Yes, your employer can reimburse you by check.

Can I travel out of country while my H1B amendment is pending?

You should really speak with your attorney regarding this issue as he/she is the one who is familiar with all facts of your case.

Can my wife work while she applies for new EAD besides previous EAD?

She cannot. She also should inform her employer that she is in the process of getting a new EAD.

Should I apply for the change of status from b2 to f1 during December 2014 for the janaury 2015 intake?

I think it will be safer for you if you apply for F1 overseas.

I am with Company A on H1B, I am going on vacation while Company B is applying for H1B transfer.

If B filed while you were still in status, you should not have problems, provided B's petition is approved. You should consult with an attorney who...

Reinstatement out of normal processing time

You can call USCIS and submit inquiries; sometimes it works, often, however, USCIS sends you an RFE just to starch time even more.

My husband has L1 visa, I have L2 and EAD card. We work for the same employer. We are also in process of green card.

Your questions require review of your contract and company's policies. They are not connected with the Immigration law.

I would say, yes, it does. The OPT may get denied because after i 130 is filed, you showed an immigrant intent, and hence all applications that...

Leaving sponsoring Employer

There might be questions when you will file for citizenship.

Interview for her adjustment of status? Nothing, really, only questions regarding your marriage (if it is true) ; and its timing; and questions...