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Although I could copy your post and paste it into the web form, there are a few questions asked that only you can answer.
One trick that works in regular filemaker that may transfer to Filemaker GO would be to define a text calculation field that returns the contents of your current text field and place this on your layout. Since it's a calculation field, it's not editable--and this may keep the keyboard from popping up, but you'll still have your scroll bar.