It is possible to use MS cluster with Oracle Fail Safe without, but in this case, you will need:
1)identify additional resources needed Oracle (discs)
2)determine the order of services to start Oracle
3)to replicate the installation of the registry and other configuration of your Oracle installation, etc.
Oracle Fail Safe, for example, when adding a database to a group, automatically adds the same group of drives depends on the database, and determines that the disks should be available before running the database. In a planned failover, Oracle Fail Safe performs a checkpoint.
Oracle Fail Safe also has a command line interface that can be used, e.g. backup scripts.
As I recall, if you use FailSafe it automatically launch and configure services, and verway node (provided that there is installed). To minimize downtime I recommend to use the circuit Active/Passive in a cluster.
This configure will not prompt, do not remember, but there is a manual: download.oracle.com/docs/html/A96685_01/toc.htm