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When exporting the project as dva, there is button (labelled "Connection Credentials") which can be used to control whether or not to include the connection credentials.
If the connection credentials are not included, ODV will prompt user to enter the credentials (username, password) after importing the project. This is answer to one part of your question.
Option/Feature to select the connection when importing the project isn't available. Allowing the user to select an existing connection to be used with each data set when importing the project will be very useful (can stop connections from getting over written which impacts other projects).
Thank you. seems this may have been added in the newer versions which I've checked and confirmed on.