The Startup.grg file
At startup, the first thing that TVPaint Animation does (after displaying the main toolbox, but before giving control to the user) is to run the Startup.grg script (which should be in the same directory as the other scripts).
When there is no Startup.grg file, nothing will happen. Otherwise, you have at your disposal a startup file that gets run every time you load TVPaint Animation.
If, for example, you rename the Logo.grg file to Startup.grg, it will load the TVPaint Développement logo to screen every time you run TVPaint Animation.
You could also, thanks to a simple George script, define all your preferred parameters. For instance : load a project from your harddrive, change the current colors, add some layers to your project, etc…