Try this:
Code:
/say #guild create <leadername> <guildname>
Can't use #commands with groupsay set as default unless you /say it :P
I don't think the chat feature at server select works. There might have been some work done on it, but I don't think any was ever functional enough to be added. There isn't really any need of it anyway other than completeness of the project (which we have much higher priorities than server select chat anyway).