yeah, they've been following it pretty accurately but at least the bad ending could be changed...
as for alternate stories, actually I'd like to see Tomoya x Ryou (eeto... the shorter hair twin... I keep confusing their names)... she likes him and we never saw any closeness between them
or Tomoya x Kotomi but that's just cuz I love her so...
and well, if you want other animes - skip beat is awesome.. as is maria holic