"Is there a way to make an alias on AD in the magic triangle configuration?"
This Forum is specific to OS X Server only so please don't take this the wrong way but I would think you should be asking this question in the Microsoft TechNet Forum.
However, from what I know of Microsoft's Servers, I think this should be a fairly easy thing to do?
I'll post on Microsoft forums if I have to yet my uneducated guess is there are less magic triangle users there than here... I'm posting what I did and the results on the slim chance this thread helps someone else... I understand how AD works with Windows clients, yet I'm unsure how the Apple AD plugin under 10.6.8 fully functions with AD...
I was able to change the user's name and verify it worked. Here is the article I used for reference.
I changed the user's name in the main account field to her married username and changed the pre Win2k account field to her maiden username. When logging into her Mac, both accounts goto the same place yet the home folder name changes based on login. - meaning items in her home folder are identical between user and alias. So that seems to work.
I also renamed and changed the user's account name to her married name in AD, yet the login name (seen under "Log Out User..." from the Apple menu) was still her old name. To remedy this I logged into her account on her Mac and manually changed the Apple Account Name under System Preferences > Accounts > Full Name.
I think this is resolved, yet I plan to test for a while. If anything changes, I'll update this ticket.