Hi mark,

> Where can the border radius and width of the viewport dividers changed?

That particular thing is still controlled by a bitmap image, you can edit the file \ui\ViewportForeground.png in an image editor program to alter that.

The image needs to have a line of white pixels on the top and left side, with 2 black dots marking where the corner areas are. The area in between the corners is stretched when the bitmap is drawn.

- Michael