add utm_nooverride or similar functionality

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Name of related component: Tracking Code (analytics.js) / measurement protocol

Request summary:
Have some setting that tells Universal Analytics to not override the previous 
traffic source

Use Cases:
Adwords brand campaigns often overshadow generic campaigns so for clients that 
still use classic analytics we can use utm_noverride on these campaigns.
This option apparently does not exist in Universal Analytics. I tried to set 
the campaign source to an empty string whenever the url contains utm_nooverride 
but this seems only to work for custom campaign tagging and referrals, but not 
for auto-tagged Adwords campaigns.

Of course we could use multi-channel funnels and attribution modelling to 
evaluate the impact of generic campaigns to but this is not really the same.

Could utm_nooverride or some similar functionality be implemented in universal 
analytics?

Thanks

Claudia

Original issue reported on code.google.com by claudia_...@kosny.com on 9 Mar 2015 at 2:04