Yes, those are good requests. I'm not sure when we'll be able to update Fiesta, but definitelly, these are important updates. By the way with Ctrl+mouse wheel over the show tracks you can zoom in/out.
For the stop show key - our idea was to disable all possible iterruptions of show including some key(it was even not possible to play the show in the past with some key). That's why there is no key for stop. I understand it is not comfortable for show creation, but it is important at event - we did lot of events and tried to develop Fiesta to be as safe as possible. So that's the reason, why stop is not there..
The automatic scrolling, well .. there is already possibility to display current playing position(edit FiestaSettings.xml and change false to true at <DisplayShowPreviewLine> node). The problem is, it is relatively time consuming. It's quite usual the Fiesta needs 0-5% processor time - if you enable this feature, it's a lot more. And if we would even scroll the show, it would be a lot more... anyway, it's good feature, we'll think about it...
The moving the effects between show tracks, yes, this would be possible.
Yes, I think I understand. You would need 2 separate time lines - one for effect movement and one for setting the start of the show. That could be interesting. Anyway, it's more complicated as it is now... so I'm not sure, what would other users say.
No, now the show can't be played from bookmark, you can only use bookmarks to set position of effects according them.