64-bit CentOS is stable. DirectAdmin works on 64-bit CentOS but is listed as beta by the DA programming team.
The issue Front Page Extensions is that Front Page Extensions has been discontinued by Microsoft. Since the code is not open source, what we've got is all we've got. Microsoft isn't going to authorize the development of FrontPage Extensions for 64-bit operating systems.
So it'll most likely never be available.
Beginning in 2007 the hosting companies we own are going to advertise Front Page Extensions only as a legacy product, with no guarantees.
Jeff