scaffold-generate requires a webRoot value to be provided for additional parameters to be displayed.

[Devoxx]$ project-new --named cdbookstore --topLevelPackage org.agoncal.cdbookstore --type war --finalName cdbookstore ;
[cdbookstore]$ jpa-generate-entities-from-tables --jdbcUrl jdbc:postgresql://localhost:5432/postgres --userName postgres --userPassword postgres --driverLocation /Users/antoniombp/.m2/repository/org/postgresql/postgresql/9.3-1100-jdbc3/postgresql-9.3-1100-jdbc3.jar --hibernateDialect PostgreSQL\ :\ org.hibernate.dialect.PostgreSQLDialect ;
[cdbookstore]$ scaffold-setup ;
[cdbookstore]$ scaffold-generate --   TAB
--provider --webRoot

[cdbookstore]$ scaffold-generate -- TAB
--provider --webRoot

[cdbookstore]$ scaffold-generate --provider Faces --webRoot test -- TAB
--targets --pageTemplate