not 100% sure if this will answer your question, but in the timeline you can specify duration.. it might be cutting it off because it's not set to play very long. The onload I think you can find if you lock all the layers and it's the default in the action menu. Probably are other ways but that's how Ifigured it out.
When nothing is selected choose "Add Interaction" in the timeline. "On Application Start" will be the default event. This got moved after beta I.
As for repeating, Catalyst doesn't support this yet :-(
There is a button called "Loop" in Properties.