Cloud integration with CRM - Partner Functions based on Document Type

Hi,

We are integrating SAP Cloud for customer with On-premise CRM system and I have few questions related to Parties Involved in Leads & Opportunities:

1. Parties Involved in Transactions(Leads, Opportunities)

          - SAP delivers some of the Parties Involved Like Account as Mandatory and it cannot be changed in Cloud configuration. In our case, we do not                 have it as mandatory in partner determination procedure in CRM system – How can we change this behavior?

          - Subsequent question is – How can we change the description for some of these standard delivered parties in Cloud. I do not see the                               descriptions as changeable in Cloud configuration.  – Can we change in Adaptation mode, because I do no see any possibility.

    2. Parties Involved based on Document Type

          - Today in cloud, Parties Involved configuration is not based on Document type. Can we configure in cloud somehow to make it Document type                  specific without having to do anything on Cloud Studio?

Thanks,

Siva.