Yes I researched this I-539 form. I'm not sure if they would approve a change from a student visa to B-2. I researched a lot about this on the Internet but found nothing, nobody who has been successful in doing that. So I don't know if this would work at all. Also, once I do that and are denied, it may be more difficult in the future to get another visa, I assume. But I also don't know. So I don't know yet if I will do that or not. Probably not. As far as stretching the welcome, well, I have paid thousands of dollars in tuition and also I worked here for a few years (CPT and OPT) and paid thousands of dollars in taxes. So I wouldn't quite call it like that. Had I done the same thing in another industrialized country, such as Australia, New Zealand, etc. I would have already earned my residency permit many times.