If I were them, I would make 2 movies for Dark Kingdom, Black Moon, Dreams and Shadow Galactica Arc, and 3 movies for Death Busters Arc, and 4 movies with original plots, take place in "peaceful time" between the big 5 enemies.
While I agree that the two SME movies has short length, they didn't use the screentime wisely. Characters have to talk in turn (Princess Mercury, Princess Mars...), the movie doesn't focus on important scenes enough but waste time for trivia ones, the dialogues are too long, they could have paraphrased 30% of them...
Am I the one that doesn't like Moon Effect being used in the final battle? They should have used a grand instrumental song, like the battle with Death Busters in Sailor Moon S.