That sort of thing you would have to ask VMware about. vCenter is their product. One of the issues here is that in order to put in any other type of authentication method, you'd have to change all sorts of things. PowerCLI, vCenter client, Web Access (tho that would be fairly easy), Perl, etc..It's non-trivial if you think it thru.
View was relatively easier as the authentication is done at the Java-based web server (View Manager/Connection server) and there's lots of examples and precidence there.
I would suggest what I suggest to everyone I talk to. Create a management-only LAN. Protect that LAN with an SSL VPN that supports SecurID and/or some View desktops that are in that LAN. Remote Desktop into the LAN via the VPN or View and run vCenter client that way. At least then you have two-factor authentication protecting the resources.
You may also consider a solution such as Hytrust. (Not an RSA product) It takes the management LAN concept further.
mike
