This is what I do:
My current best method to paginate perplexus post on a mac is as follows:
1) have text in TextEdit
2) Employ line breaks <cr> - don't wrap around.
3) For a blank line, use 2 blank lines - perplexus will swallow one
4) do not make lines longer than 80 if
possible - perplexus likes to wrap these after adding a
blank line.
5) cut and paste into perplexus
6 Important - hightlight and use preformatted choice