When we create some geometries like circle, rectangle etc. in Custom Overlay step, we can not arrange the thickness of that geometry. We can not make something to be more apparent with changing the thickness.
The worst part comes out when you try to save/log an image while working with a high resolution camera. It is quite visible in VBAI Image Display window, but when you look at a logged image, you can not see any overlays because it has very small thickness(probably 1 pixel).
So, I think this feature can be added very easily and can help us create better visualization.
This is now available in Vision Builder AI 2015 for Point, Line, Rect, and Rotated Rect. Thanks for the suggestion.