3. the title “stardust” is boring

2. I would change yvaine’s soliloquy about love always being unconditional, because there are different kinds of love and unconditional is one of the kinds of love, not the only kind.

1. I’d have the consequence of tristan’s out-of-wedlock birth be a curse of some sort and the lifting of the curse be necessary for a happy ending.

perhaps the lifting of the curse could occur at the “coming together” scene by the gap in the wall:

in the scene before, tristan realizes that yvaine can’t go thru the gap in the wall.
in my version, it is tristan’s father who realizes this (not tristan).

in the next scene, all the principals are racing toward the gap in the wall.
in my version, tristan’s father is also.
in the movie, princess una arrives just in time to stop yvaine from going through.
in my version, she is not in time — yvaine reaches the gap first and turns to stone.
tristan’s father and princess una arrive not long later, and there is a bittersweet reunion.
they get married on the spot (perhaps the old gatekeeper marries them).
this lifts the curse on tristan and he is then able to go forward and turn yvaine back into a person.