Workflow start form with save button (no submit)

If adding a Button control to my workflow start form I can select which button action to use:

• Save
• Save and Submit
• Cancel
• JavaScript

The 'Save' and 'Save and Submit' action however do not behave different as far as I can see.

If using the 'Save' action in a form, the form is submitted and the workflow is started.

I would expect it to save the form but not start the workflow.

Or am I wrong?