Editing World Composition Tiles

getting to know the levels and world composition and can push them around no problem.
however the editing possibilities seem to be beyond rudimentary.

  • cannot change the z value other then reimporting the landscape.

  • cannot rotate or mirror tiles. i tried editing the landscape inside the level tile itself but it always snaps back if i rotate or mirror it. moving along x and y works.

  • even worse, for the life of me i cannot even zoom out and edit tiles like a sane person.

please help.