I have installed WordPress today and started my first post ever, yay!
I got quickly annoyed by the fact that I cannot specify the number of new lines I want -- even if I follow the instructions that says to do a new line with two spaces -- it just does not work!
I took 5 minutes of my day to peek in the code and I have made a tweak in it which allows me to have real spacings between each paragraph (but not more). Since I think this is a bug, I guess it will be fixed on a future version so I'm not wasting any more time on this problem.
At line 71 in file wp-includes/formatting.php (version 2.3.2), replace this line...
$pee = preg_replace('/\n?(.+?)(?:\n\s*\n|\z)/s', "<p>$1</p>\n", $pee); // make paragraphs, including one at the end
... with this new line!
$pee = preg_replace('/\n/s', '
Make sure you backup your files before attempting this modification!
NB: In order to have a double-line spacing, you must use shift+enter, using only enter will not work.
Happy new year folks!