Unify Grease Pencil and Freestyle LineStyle and make it Realtime

I am currently working with blender on Animations with Grease Pencil and at the same time try to use Objects with Freestyle. I found myself switching to the Solidify-Method on Objects (Solidify Modifier/Material Backfacing) so I can see the Outline as I work. There are several things that I am confused and a little sad about and I would like them to be better streamlined.

1. Freestyle only renders after the Render Only; that is very sad if you work with greasepencil, because Freestyle has so many more Options than the Solidify-Method, and checking quickly becomes a chore the more objects you have in your scene. Sure you can work with the compositor, but yeah.. Working together with Greasepencil it's just sad.

2. We can't use FreestyleLineStyle Material for the Grease Pencil, which is also sad, because you have to make very different materials for that.

3. Materials on Greasepencil work very different from 3D object materials although they are shown as the normal 3D Object Material Type. They can be "manipulated" inside the NodeEditor (putting nodes in and such) the same way, but it doesnt do anything with the stroke at all. It leaves me thinking there is something more coming but I dont know.

So now we have 2 Systems (not counting the common 3D pipeline) that I actually would like to use together, but they are both very disconnected work very different from eachother. It would be great if they could somehow be fused together so we can see realtime what we are working with, and change them all together, if we like to.

My Suggestion would be to turn FreestyleLineSets into advanced options of GreasePencil Layers, and incorporate FreestyleLineStyle into the GreasePencil-Material so that we can use the nodes. I would also suggest that Options like Blend and Opacity, as well as Adjustments should be in in Material Settings as well as in GreasePencil Layers because those settings are concerned with how the Line material looks like, and could be adjusted with material Nodes.

Finally it would be cool to have compositor-Layers for each GreasepencilLayer or Groups of GreasepencilLayers.

This way it would be a more unified and streamlined approach to line-art in blender, mixed with all the awesome other stuff.

Please let me know if something is not clear in this proposal, as I think 2D/3D animators such as myself could benefit greatly from this!