Outline mode for layers

This is a feature avaliable in Mx Freehand, Illustrator and the OSS scribus.
is the option to set view mode for layers only.
on scribus you just click on icon in the layer dialog and the to change for outline view mode, this saves computer resources and make more easy to trace your image/draw.

the descrition of this feature in scribus wiki :
"Outline mode for layer objects: This option comes in handily if you want to speed up the performance of Scribus, as all objects on a layer are only displayed in a "wireframe" mode. This is especially useful when a layer contains complex vector graphics."

i create 2 screenshots to illustrate what i telling:
http://storage5.static.itmages.ru/i/13/0531/h_1370029411_1964567_e7cb0f81d3.png

http://storage1.static.itmages.ru/i/13/0531/h_1370029580_1815905_5ad32d2b19.png