1. "Refresh all" as a separate button would be quicker than having to select the small arrow and carefully selecting the option from the drop-down.

I could add a shortcut key for this.

2. A button for splitting the screen, or some other way.  I don't find it at all intuitive to get the split screen option -- took me ages to realise it was possible and even longer to work out how to do it (by dragging one tab onto another's window).

Right, the tab interface is not very intuitive so far. This will change in future releases.