I chatted by email with Stephen Greenfield of Write Bros. (One perk for authors: you get tech support from the company president!) I was happy to hear they're going to overhaul the program, and it'll look and act much more like proper OSX software. There will be a View menu, though it's not clear if you'll be able to ignore page breaks on screen.
Many of my issues are really documentation issues, i.e. if you want to put a parenthesis into dialog, you can do it with "control-paren". But that was sort of my point. You shouldn't have to read the manual to use the program; it should just make sense.
When I get the new Screenwriter beta I'll report how it compares with 4.8.
They're still working on importing from FD properly...