Toby - I've been playing about with the same thing - I'm tinkering with a LoaderProxy right now so I can tie it directly to a mediator and stage progressBar clip, but I don't like the structure. Also, I don't want all the assets pre-loaded because that makes startup to slow.
I like the asset load command idea, but really I want to tie in sections to assets with lazy loading so that all assets are added to the BulkLoader with a section id or type, but only loaded when that section type becomes active.
Not sure. Still playing with it.