Recover until cancel in RMAN

In sqlplus utility, it is possible to do "recover database using backup controlfile until cancel". The "until cancel" part is important because the database to recover has been created by a storage snapshot and I don't have all the logs until the current time.  In sqlplus, with "recover until cancel", the recovery stops after the last available log has been applied and "alter database open resetlogs" is successful. In rman, however, I need to look for the last SCN, which is killing the automation effort. If I don't do that, the rman fails and it doesn't open the database. Is