Can I start an app from a script of does it have to be a page?

Can I start an app from a script of does it have to be a page?

A Lianja App needs at least one page.

I don't mind it having pages, I just want to do stuff first.

Yes I know there is an init method (can I cancel a start-up if I return false from it?) but I want a few global things available before that form comes up.

This functionality is now all available in beta4. You may now want to take a look at the App Center, roles in the users workspace, and permissions at the app, page and section level. Take a look at the attributes for pages and sections. If you want an init delegate for example just click the button to the right of the init delegate field in the advanced panel of the attributes dialog and you will be in the editor where you can code what you want for that event.