For the 2nd question the DACLs are applied to a session. The switch will automatically substitute in the source IP address. You shouldn't be specifying the source IP. I don't thin I have tried using source IPs in posturing rules. What is your exact use case?
What is their reason for asking this? I have many customers that ask for things that don't make sense because they don't understand how thing work. The redirect ACL and DACLs are applied to the user session level. Specifying a source IP makes no sense.