How about Zerophilia. From wikipedia .. "Zerophilia" is a fictional condition affecting less than 1000 people in the world, who have an extra "Z" chromosome. Following their first experience of sexual intercourse, zerophiliacs begin to change gender whenever they are sexually aroused.
If you don't mind having some animated works on your list Revolutionary Girl Utena has some gender roles switching.
Also Enchanted Princess saving her prince? Billy Elliot Boxing lessons turn to ballet lessons? Velvet Goldmine Lots of guys who look like girls and sing and stuff? Camp A straight guy into theater? Shakespeare in Love Female actress pretends to be male in order to get part? A League of Their Own Girls play professional baseball since all the men are at war? Miss Congeniality Tomboy FBI agent infiltrates beauty pageant?
And that's all I can think of at the moment. I hope I was of help.
And for minor cross-dressing you could consider Sorority Boys and Ed Wood. Nice list! :)
Also
Enchanted Princess saving her prince?
Billy Elliot Boxing lessons turn to ballet lessons?
Velvet Goldmine Lots of guys who look like girls and sing and stuff?
Camp A straight guy into theater?
Shakespeare in Love Female actress pretends to be male in order to get part?
A League of Their Own Girls play professional baseball since all the men are at war?
Miss Congeniality Tomboy FBI agent infiltrates beauty pageant?
And that's all I can think of at the moment. I hope I was of help.