I hope I can make this make sense.

In real world application, your rig can be completely addressed, mounted and ready to use but until you attach your dmx signal you can't use any of it right.

While this is not necessary in the virtual world, I know that it would help, me anyway, to build a rig virtually and have an accurate cable report if I couldn't make a fixture work in my visualizer until the patch was "verified" with an appropriately attached signal cable.  Also make it optional on every build.  I would see myself staying in that mode because I have to build a lot of different one-off shows, but the option to not require connectivity would still have benefits too.

Not sure how complex this would be, but I know I would use the crap out of it.

Thanks!