How do I disable hiding of the mouse pointer while typing text?
This is the default global behavior and can't be changed through a system preference. (I can't find any third-party utilities to change this either.) 

Apple's reasoning is probably that users (but not all users) don't want the mouse pointer to obscure the text while typing. A developer might work around this by using NSCursor with setHiddenUntilMouseMoves:NO or unhide, etc., but this would be considered bad form due to creating an inconsistent user experience compared to other apps.