I deal with quite a few objects with interesting edges, and it's becoming impossible to see which element belongs to which object, when they all have the same color. Is there a way to set custom wireframe colors?
When I have say 3 objects that I am working with and one object I am aligning to another the object is silhouetted in my case with a 'orange' outline against all the grey. (This colour can be adjusted in preferences) If the object is in edit mode again the wireframe is a different colour.
You also can use the align / snap to feature.
I personally do agree though that multi colour assignment to wireframes would be useful in many situations.
Here a Tip since colored wireframes will not be coded into blender. Select your object press M move it to another layer, there you can work alone on them. in the next version of blender this layer and grouping system will be more advanced. So i think thats the way to workaround this.