[LAU] Ardour tutors available?

Hello all, I'm currently getting to know ardour (3.5 on Ubuntu Studio 14.04) and wondered if there's anyone on the list interested in being a one-day guru, answering smart and silly questions alike? I do usually look up the online manual before asking, but sometimes normal searching gets me nowhere... For now, 3 questions that's been bugging me: 1. Is there a way to click and drag or similar to navigate back and forth along tracks? There's a click and drag "navigator" at the bottom of the screen, but with many tracks I find it hard to move only sideways, and not also up or down. 2. How to undo region deleting? Must be something obvious that escapes my eye... 3. How to access session undo history, and restore things done in previous sessions? All the best, Alf