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Dear Bogdan,
Sorry for the rather late reply 🙂
The answer is yes, as of Revit 2015 R2.
For more details please refer to this thread:
Exported image line weight (thin line) and rendering setting
Thank you.
Best regards,
Jeremy
A solution providing programmatic control over the Thin Lines setting is presented by Revitalizer and The Building Coder here:
http://thebuildingcoder.typepad.com/blog/2015/03/thin-lines-add-in-using-ui-automation.html