What are the B1/B2 VISA entitlements beyond what the USCIS site lists as it says "not limited to" in the list?

You have no entitlement to employment in the US on a B-1/2 visa.

You may be involved in a passive investment, however, the TN does not permit you to work outside of the sponsoring employer's organization.

H1b transfer

That should not impact the process, although there may be a technical lapse of status there.

My friends mom is applying for Tourist Visa in US while her husband is married to another woman and lives in US.

Your friend needs to consult with an immigration attorney.

Is it illigal to have a mobile app (and getting money from it ) in the app store while having a R2 visa type?

Correct. the R-2 visa does not allow you to work and receive payment for services in the US.

J1-Visa in Brazos County Texas. I am charged with Class C Theft (criminal case dismissed). Will it still affect my VISA?

If you only have one "petty offense," it should not render you inadmissible to the US.

I am on j1 visa, my employer told me that they want to discontinue the program and I have to go back to my country.

Usually no more than 30 days is allowed. You must consult with an immigration attorney as soon as possible to make a plan.

Can I stay out of US for 8 months before I apply to obtain the U.S. Citizenship?

A departure in excess of 6 months permits the USCIS to presume that you have broken the period of continuous residence required for naturalization,...

Immigration Attorney Fee: How much is worth my Green Card?

You cannot expect attorney's to quote fees on-line. Every case is different and you could expect a range of fees depending on which lawyers you...

Can I use my own income in form I-864 (i'm spouse of petitioner)?

Complete instructions for the I-864 and I-864A are available at www.uscis.gov.