Can ebooks or PDF files or manuals etc. be Photoread on the computer? seems like I can maintain soft focus and control page turning easier.

Yes, many photoreaders do that already.

when one Photoreads on the computer should you scroll or page down/up?

Page down / page up.

When super reading and dipping you can do either.

Therefore, how big is the paper size then ? Is it to 100% or 150 ?
Do I have to see the complete paper ( 4 corners )
and how fast should I go in Page up or down ?

PhotoReading step, page or space bar up and down, I recommend a rhythmic tapping. Do not scroll

For activation scrolling is an option.

AlexK

Dear Alex,
many thank for your prompt replay.
I have a question regarding the page or space bar up and down.
How much time should I spend between each page up/down ?

As soon as you lift the finger drop it again.

AlexK

I have actually had tremendous success with just hitting the page down key and holding it down. In my experience, the faster it scrolls the easier it is to get the information into your brain. One thing I've noticed however. If you are using Adobe Acrobat Reader to scroll, sometimes it will hang up for a second or two. So what I did was start opening the PDF files in my browser. So if I download a PDF, I'll right-click on it and open it with Safari (or Internet Explorer, Firefox, or whatever you're using). You can scroll through the pages almost twice as fast.

~NeverSpeak

I've noticed that it skips as many as 16 to 30 pages when you hold the key in the reader. That's one reason I recommend tapping. I don't open it in a web browser I find it hangs most often there.

AlexK