> if Andreas Fakelhan makes a new version of RebelSDL does he will use your code?

This wouldn't make sense as RebelSDL isn't an SDL implementation but an interface from Hollywood to an existing SDL implementation.

> the current RebelSDL uses the SDL 1.0

No, there was never any (public) RebelSDL interfacing to SDL1. RebelSDL has always required SDL2. (Besides, the Amiga got SDL 1.1 already 20 years ago and SDL 1.2 as much as 19 years ago.)

> a future version with your work will improve this

It's true that the more complete the SDL2 implementation is for MorphOS, the more SDL2 functions can be offered by RebelSDL for MorphOS.