found the answer already....
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just a note on your found string:
With my German InDesign this string would not work.
Instead I'd use the internationally working string:
i see.. Thank you.
Here a list of all locale independent strings that should work for strokeType:
$ID/Canned Dashed 3x2
$ID/Canned Dashed 4x4
$ID/Left Slant Hash
$ID/Right Slant Hash