Can I convert from a h1b visa to a l1 visa even before the h1b visa expires?

Yes you can.

GC for parents. Naturalization in hand

You need to prove the family relations. THese documents would make it easier but you may still accomplish what you want without them. Meet with...

This is a normal practice fro USCIS

Any way around the i-864 support form?

You can have someone act as a cosponsor or perhaps your spouse has assets that will allow him to qualify on that basis

I am a Canadian citizen, with permanent residence in US, with a 2 yr probation for misdemeanor, can I travel to Canada and back?

Some misdemeanors can cause you to be inadmissible. You should discuss with an immigration attorney who can review the conviction and then advise...

Bring spouse in L2 when in L1B I94?

Yes to both.

I know a man who paid and got married with US citizen women for a green card. They never lived together. What shall I do?

You alone can decide what to do.

What is the max time uscis can take to make a decision on a pending case..

Worst case would be years, but by that time you would have probably filed a mandamus action.

How long i can stay out of country with valid H1B visa?

If your employer agrees

What does it really mean the Provisional Unlawful Waiver?

You can apply for this waiver ONLY if you are in the US. if you leave, you are not eligible for it, although you may be eligible for other...