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You don't have to use the callback function, you can declare your scripts like this:



And then use the Y variable as you would have inside the callback.

I generally only do this for testing purposes, however, as the benefit of using the callback is that you don't have to worry about your code interacting in strange, unexpected ways. For me, each feature I'm implementing on a page gets it's own instance of YUI3 and exists in it's own callback. If you do want interaction between modules on a page, you can use the YUI.namespace function to create a global namespace for values.

As for the build parameters, you either need to directly modify the defaults in the YUI file in your local copy, or you'll have to set the Base url in all your subsequent code. I use a global configuration variable on my site to deal with this.