Thank you for your post, and I apologize for the late reply.
No, you cannot display a scroll bar for non-editable fields. One option is to make the field a button. That way, when you click on it, you can change to another layout that displays the entire contents of the field. Another button can be used to return to the original layout.
Thanks for the tip. I will try that
You could also add an unstored calculation field set to display the contents of the original field, with scroll bars enabled and edit in browse mode enabled.
Since its a calculation, it cannot be changed, but can be scrolled which would then illeviate the need for additional layouts and buttons.
Altough, ive not tested on IWP, this is what I currently do in general. Hope this helps