I was thinking that you can improve the "computer import wizard from AD" very easily.
In the window that imports accounts from AD add 3 filters:
1. choose an OU (not just a domain)
2. only servers or also workstations
3. filter out accounts that are already in RDM (in here give 2 sun-options: 1. name only 2. ip based - slower)
I think this small development will be the step you need for start easy sync to AD (which is a very missed feature from RDM)
I have entered a feature request. Thank you for your idea.