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The following patch adds a configurable delimiter to the action "Pass ids as arguments to a page (views_bulk_operations_argument_selector_action)".
For security I have limited the options to a select list of a comma (,) and plus (+) for use with the views contextual filters (AND / OR respectively). I chose to make it a select list for security, but it could easily be extended with more delimiters or a text field for any value.
Please review, thanks.