the name of the SQL service in the cluster, i.e. the name you use to connect to the database engine.

The packages are normally imported to msdb, thats better for security and backup. You can store them on the filesystem, on storage that is part od the cluster so it fails over with the cluster.

Yes you need to amend the .ini file so the server name points to the cluster name rather than '.' (on both nodes)

see http://dougbert.com/blog/post/ssis-and-clustering-what-you-should-do-instead.aspx