You are also right that you and others gain some benefit from the techniques/tools you are given. We all gain the benefit of "better teeth" if we drink poisonous fluoride in our water
What about you requesting adding vitamin D instead of fluoride to the drinking water? ;-) ..
I apologise if I sounded dismissive, I was using simile. The fact is we do gain some benefits from fluoride in drinking water and these are outweighed greatly by the toxic effects. The same I believe to be true of Goenka's method: there are benefits to be gained however these come at a great cost.
As to the specifics you mention they all accrue from properly based meditation.
Body scanning is detrimental as it is a fabrication and not an acceptance of "what is".
The fact that you are moving towards a more whole body approach suggests to me that you have personally found the limits of Goenka's teachings.
When doing Vipassana, when you move from to bottom on your body, moving from sensation to sensation, is it OK to be visualizing your body parts as you do this.
Secondly, I have started to read the epic known as The Book of Secrets by Osho and I was wondering if it is OK to do both Vipassana and meditations from Osho's book at the same time?