Consider yourself lucky. I have seen pdf files created from MSWord docs that, when cut and pasted, render with a carriage return after every word! On the other hand, I have also copied and pasted text from pdf files which I didn't create (and hence don't know how they were generated), which has no extraneous line breaks.
Seriously though, I have just done a couple of quick tests with interesting and unexpected results which suggest you look elsewhere than FM for your solution:
1. I copied and pasted a paragraph from a pdf generated from FM into a text file (using TextEdit on a Mac); result, carriage return on every line.
2. I copied and pasted a paragraph from a pdf generated from MSWord into a text file (using TextEdit on a Mac); result, carriage return after every word.
3. I opened each of the above pdf files in Preview instead of Acrobat and repeated the above tests; result, no extraneous carriage returns in either case!
So perhaps your client could try something other than Acrobat to view the pdf files and extract the text.
Hope that's of some help.