That's one special case and he mentioned he wouldn't do it again.
Will I ever use this method in another screenplay? Maybe not.
There are tools to do that differently. Often times, I need to 'decorate' a screenplay (TV) with drawings for producers and as a selling tool. It's like an illustrated screenplay. I do it in... Word. Of all things. It's not a production screenplay, so a simple copy/paste between two applications works best. Paste Courier 12pt text into Word, style it a bit and embed images. Done.
If you want to have pictures follow your text, do it in Word or Scrivener (better). Scripts have a certain layout and rules which are there for a reason(s). Reasons which are important.
My primary problem with FD is no support for UTF at all. Real fun writing in other languages. Sometimes even impossible. Fade In saves the day.