Fixtures wishlist

For #1: You could try the Fixture Sets plugin, although I haven’t needed this personally. One set is enough to worry about, but to each his own:

For #2: Fixtures are evaluated with ERB. Just put some ruby between <% %> and it will execute.

For #3: Try the Fixture References plugin:

Also if you want to dump your existing database tables to yaml fixtures, try the AR Fixtures plugin -