Best practices to design OWB Process Flows

Hi All,
I am using OWB to develop historical data warehouse. For this I have created few mappings that load data from source tables to staging tables and then from staging to target tables.
Now I am designing process flows to execute these mappings. Can someone suggest me what are the best practices to design process flows?
I have few questions in my mind that I am looking answers for:
1) Should I keep the mapping to load staging and target tables in different process flows or in one?
2) Do I need to include an email activity for each mapping failure or in other words how can I integrate all mapping errors in one email?
3) I am using two outgoing transitions from each mapping; one for success and another unconditional, is that right method or I should use three transitions one for success, one for warning and one for error?
4) I have created some email activity templates that I am using in process flows. For development environment I have used test from_address and to_address. But when I actually deploy these process flows in production, these addresses will need to be changed. Will I need to change these address individually in each process flow or in other words what is the best way to deploy process flows?
I am using 10gR2 database and OWB.
Any help will be appreciated.
Thanks,
VKumar

Any help will be appreciated.
Thanks.

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