If I'm setting up a brand new multisite installation with WordPress in it's own folder (say /wp/) why can't I configure the network to use subdomains instead of subfolders?
Currently, if I try to setup the network with the WordPress core in it's own folder I'm not allowed to choose between a subdomain-based or sub-folder based network. I must use sub-folders. What are the technical reasons for this?
I've scoured trac and Google for an answer to this question with no luck. A more detailed explanation than what is provided on http://codex.wordpress.org/Before_You_Create_A_Network or http://codex.wordpress.org/Create_A_Network would be greatly appreciated.