In the Expression Editor, the Load, Save, and Run buttons have been moved to a pop-up menu. Since the Expression Editor is used to attach a script to an object, you need to have an object selected before you can open the Expression Editor.

The scene script is saved with the scene and executed as soon as the scene is opened. It lets you define procs and initialize variables. Both of these editors, as well as the History window, are now resizable and scrollable, and include syntax coloring, undo, and line numbering. You can drag text from any of these windows to the Favorites palette to create a new shortcut. When you do, you will be given a dialog box that will allow you to name the script. It will be saved under that name in the "Scripts" folder.

Improved Timeline Navigation and Control
PiXELS3D version 3.2 had two buttons in the Timeline window that allowed you to control the type of function curves used: Auto-smoothing Bezier (which uses the previous and next control points to smooth the curve), and Linear. There are now buttons for two new types of function curves: Constant and Flat-tangent.