vhost aliases
It would be nice to be able to define several domain name for a single vhost.
Now, if you have an Apache vhost with a ServerName and one or several ServerAlias directives, you must set one vhost per domain name in LL::NG config. It would be better to define the ServerAlias names as aliases, for legibility and to spare memory (since precompiled methods for access rules and headers would be shared). By the way, it could also be used for twin apps (I mean, apps corresponding to different Apache vhosts, but with same LL::NG parameters).
An improvement would be to be able to set a regexp instead of a list of aliases.
About manager, I think the aliases should be defined in vhost options.