"transpose" the rythm and rethoric

[Francois Planiol]

Hi all!

Is there, in a notes context, a simple way or a preprocessor to perform these 
changes,

- change the rythm:
- - per augmentationem / diminutionem
- - from ternary to binary (6/8 to 2/4)

- change the direction around a given axis
(f.ex. c g' \chang-dir-with-axis e = g c,)

- read the music backward ?

Well I know its pretty much asked, but I think that is quite possible and for 
composers interessant. Maybe I missed something in the documentation.

And has the idea of diatonic transposition been implanted?

Thanks for infos

Francois