For the WAB question, if one has set the WAB, it no longer automatically Snaps to the full Duration of the Timeline, as it does (expands), before having been set. I then grows, as Clips are added.
Once it has been manually set, to extend its Duration to cover the entire Timeline, I find this proceedure to be the easiest. Hit the \ (Backslash) key, to zoom to the full view of the Timeline, and then Dbl-click on the little "box" in the middle of the WAB. It will then expand to the full Duration.
Good luck, and hope that helps.
I hit the \ symbol and double clicked the box. It did extend the duration of the timeline, but any new clips added, the WAB does not snap. How do I get the WAB back into the snapping mode?
After it has been manually set, the automatic expansion feature is then disabled - unfortunately. I would love to see that behavior changes, so that one could reset the WAB to automatic expansion.