Two things would help in being able to distinguish between tabs (i.e. if you have multiple tabs of the same type open) so that one could better determine which tab they are on.
1. Make it possible to cascade the windows (split screen, cascade, tile vertically/horizontally, etc.). This would enable the user to associate a tab with position.
2. Make it possible to have text color settings per tab instead of system wide. That way, each tab can have it's own background color and text color.
These two features would be wonderful!