Exchange 2010 Resource Forest - Autodiscover

Environment:

Account Forest (No Exchange server installed)

Resource Forest (Exchange 2010 SP3)

I understand that a SCP record can be created in the account forest using the following command:  Export-AutoDiscoverConfig -DomainController <FQDN> -TargetForestDomainController <String> -TargetForestCredential $a -MultipleExchangeDeployments $true

Questions:

1.  Do I need to prep the schema in the Account Forest to create the relevant Exchange configuration before running Export-AutoDiscoverConfig?

2.  Is the switch MultipleExchangeDeployments $true needed?  Technet states that it's only needed if both forests contain Exchange but also states it's needed formultiple accepted email domains? (which we do have)  http://technet.microsoft.com/en-us/library/aa998832(v=exchg.141).aspx3. 

3. Can this change be backed out.  i.e. can the SCP record be removed by using ADSI edit.

Thanks in advance