This is one feature I wish its already included in the current release.

Siteworks for Revit Toposurface Editing, Preliminary Site Grading, and Streets Layout - Eagle Point Software

Shape Edited Roofs + Roof Fascias for curbs.

Better than Eagle Point, IMHO. Better than Floors, or Subregions. Better than exporting and importing just to get a hacked up road...

Agree with Aaron on this. Slab edges don't work with shape edited floors but roof fascias do work with shape edited roofs. Don't know why Autodesk doesn't add a road and walkway family that is based on roof family behavior. And make floor slab edges behave like roof fascias. And make roofs have deck profiles like floors.

This doesn't seem to work if the roof is both curved and sloped though. Wouldn't let me generate the fascia.

Correct. Curved and sloped you need an in place family using the same profile that we use for the fascias.

I thank you all.
I am new to Revit and I thought that maybe its my fault that I cant find a way to do it.
Nevertheless its strange that In Revit they occupy of Families and parametric calculations and they leave behind simple things like these, or for example when you want to put a simple tree but unless you put it on the plan you cant even know how this tree is for real, or when you must open two or three windows to change a regulation and then you must close all three to see what is the result.
Sometimes I think that if there wasnt under the umbrella of Autodesk the future of Revit would be dark.
And other times I have fear that they will arrive at a closed street with the development of Revit.
After all these years it is strange that these simple things are not yet resolved.
Programms like Chief Architect have so much simple and immediate regulations since the begining of their history and make a house wood frame for example is included in the program and not with external plug ins (of low quality also) that allready appeared on Revit.
The same also with dynamo and vasari.
These things are not serious for a big company.
Its like they dont have clear ideas and for this reason they have left all the weight of the parametric regulations on the external operator.
Like I said, I am new to Revit so forgive me f.o all this. (and also for my bad English).
Thank you again.

Well....glad to hear Chief Architect is popular outside of the US....(CA HQ is right down the street from me and I know people that work there....and its amazing how many builders in my area use it for design....believe me, you can tell)

Revit does has it quirks....but so does any other program, even CA has its issues that work just fine in Revit....