Questions About Using OPatch Auto In A Mixed Release Cluster

Hello DBAs:

We are 11.2.0.3 GI with RAC RDBMS and some single-instances, all releases between 11.2.0.1 and 11.2.0.3.  All nodes run rhel5; Linux x86-64.  One UID (oracle) owns all the binaries and ASM devices. 

I want to use opatch auto as much as possible to cover GI and the databases of the same release.  In a mixed-release environment, will opatch auto both skip the instances at < 11.2.0.3 and take these offline?  Or must I take these older instances offline first? 

Does opatch auto support listing multiple Oracle HOMEs if the first one is the GI HOME?  For example, will this work:  opatch auto . -oh $GRID_HOME, $ORACLE_HOME1, $ORACLE_HOME2?  I see it listed as an option for opatch (without auto), but not under opatch auto.