I haven't had time to dig too deep and find out if this messes up anything like modifiers, (or read every post in this thread, so 'scuse me if it's already been covered) but I needed to find a way to map Revit objects to my firm's internal layer standards - why they can't just use AIA standards is for another discussion...
Anyway, here's what I found
In the folder: "C:\Revit SDK 2018\Software Development Kit\REX SDK\Samples\DRevitFreezeDrawing\DRevitFreezeDrawing\Configuration" you will find the preloaded exportlayer files.
I copied the AIA one as it is closest to what my firm uses.
Pasted it to a folder on our server that is accessible to all
Renamed it so it's clear that it is a customized file.
Edited the TXT file as needed - be careful with syntax - in my case it was mostly a matter of changing layer colors and a couple of names, so that wasn't a big deal.
Now when we export to DWG, we can simply browse to that file in the export dialog, load it and create DWGs as needed...
Now if we could just find a way to have view title lines export to a plottable layer without the same happening to the view boundaries, I'll be a happy camper 🐵