Thanks Alex_5278 , I'll gladly file and forward this as a feature request for you. 
Let me know in case there is anything else you want to add to it. Also, if you have any existing example of how you imagine this could look in Enscape, please let me know and I'll put it in the feature request as well!
Hello Demian,
thanks for forwarding this. attached you will find a concept illustration of how the menus could look like (if this is what you asked for).
I suggest there is a separate menu for defining the line styles.
then those line style are being assigned to the geometry by material.
you can either apply the global settings to a material or chose one style.
i forgot to add an option for outlines on/off in each material.
maybe you dont even need a global setting, since it is being set individually.
you should not set up the style for each material individually, because you might have multiple materials with the same style.
and this would make copying very difficult.
in sketchup the styles can be easily assigned in the materials menu.
in revit you could either add a material menu or assign it - just like the grass - by name (LR = linerendering).
Stucco White LR01
Marble Grey LR02
Wood Oak LR03
etc.
or you go with the tags/keyword. in revit you can assign tags/keywords to the rendering material. so the user could add: LR01 / LR02
Hope this helps.
Best
Alex
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Gladly added your upvote as well.
Thank you very much for the nice mockup Alex_5278 , also forwarded it accordingly.
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Added, thanks!
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Thanks bsfranza! Added!
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Also added, thanks!
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Couple of additional controls would be amazing:
Architectural Sketch Lines - Extend lines past the connection to make the architectural "x" look, control the length
Line Jitter - makes the lines look more sketch
Watercolor feature - like a filter to be more water color / hand render style
Fade render - as the render comes closer to the camera it moves into a sketch/ white mode version (this could be done in photo editing after but could be a cool feature to add.)
Ghost Entourage - make transparent or silhouettes - these could be assets, but controlling the people transparency through this dialog could save it to the render settings.
Sketchy Entourage - sketch version of people / silhouettes / super low poly people - good for early versions of renders and models to give a sense of scale
+1!!
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Forwarded - much appreciated!
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