Hi Clariss,
Thanks for contacting support.
I am afraid the requested feature cannot be implemented as this option is related to PDF viewer application. For instance, for wrapping bookmarks you can check Wrap Long Bookmarks menu item in bookmarks navigation panel of Adobe Reader. I am afraid we can not extend API with corresponding option because this feature completely depends on PDF viewing application as this is just the way of representing PDF document but not the way to create it.
We are sorry for this inconvenience.