Alternatives to Domain-based Deployment extension

[mitchellt]

Hello - I'm hoping  to find some alternatives to  the Domain-based Deployment extension.  Our "dev" environments actually contain the /dev/ pathname in the source  url  for utag.js,  and for certain web properties which are actually QA, I'd like to dynamically adapt and load the QA utag environment.   

I  noticed that the Domain-based Deployment only seems to work when the pathname to utag.js is /prod/ in all environments.  Any ideas or alternatives are welcome, thanks in addvance.