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You're right that a single-action list is a list of unrelated items. Setting a start date on one of them should not affect the others.

A sequential project should work as you describe. What icon is to the left of the project name? A single-action list should have a little file box or shoebox icon to the left of the name, and the Project Inspector should show the same icon. Available actions in the single-action list should be colored blue, unless you have changed the default settings.

If you've got the shoebox icon, the Project Inspector says it's a single-action list, and you get the behavior you describe, then you've found a bug. Use "Send Feedback..." to report it to Omni.