1. "Edit / Chords-Search and Replace" is the ticket. Not sure whether that's available with the Mac version, though.
2. Lot's of 'ii v i'-s come with the Windows version.
3. You'll find a lot of standards on the BiaB Yahoogroups and on user web sites, such as the sites by Allanah and Wes.
4. White or pink noise? The melodist provides a nifty tool for coming up with sensible 'random' progressions.

Martin