Move objects in scene view before running the game

Is there a possibility to make scripts that run before I hit the play button of the game that will be able to rotate 3D objects in my scene before the game is actually running, it's needed so the user sees what will happen if he actually clicks play. So I want to be able to move/rotate 3D files in the scene view by clicking some buttons in the inspector window before clicking play, tysm!

Ps: a custom editor window where objects can rotate would be fine too, but I don't know if it's possible to rotate objects smoothly in an editor window (like rotating a picture/texture, or a button or something)