OS X V10.7 Lion :: Reverse DNS Hostname Keeps Changing

I work in an IT environment where we are adding more and more Macs every day. I have been charged with researching joining Macs to the domain. Before, we've had them unbound but we've decided to change that.Our environment is nearly entirely Windows based on the server-side. On Windows 2008 R2 servers we run DHCP, DNS, and AD. The problem is that when I bind a computer to the the domain, the hostname changes in the terminal window to one owned by an IP address previously. I'm worried that this might interfere with applications / scripts that run in the terminal.

I read that there is a hostname config file in OSX that can be configured to override this. I'd rather not do this for every computer in the domain though. Even if it could be scripted I'd have to manually type every hostname..not fun. I've read that enabling dynamic DNS on the DNS server should fix this but it doesn't appear to. We have "Always dynamically update DNS A and PTR records" checked and also "Dynamically update DNS A and PTR records for DHCP clients that do not request updates"

On the Mac client I've tried enabling and disabling the enable dyanmic DNS checkbox.. 

Is there a way to change this via a switch either on the backend or  in the client itself without having to change that hostname file?

Info:OSX 10.7 , Mac OS X (10.7.4)