I would like to share my new app for the Galaxy S5 called S5 Toolbox Addon whose function basically is to allow you to add more apps to the S5 Toolbox tray beyond the 5-app limit imposed by Samsung's stock rom. Although you can add more apps, there is a limit to what can fit the screen so just add only what fits the screen which at stock dpi is about 12 apps. At lower dpi, you can add more. NO ROOT NEEDED.
The download below is the basic version which only does what is described above. No more, no less. But if you are feeling happy and would like to support my work, then the one on the Play Store allows you to create custom toolbox lists (as many as you want) and switch between them on the fly. It includes a quick toolbox switching feature to allow you to easily switch between toolbox lists on the fly depending on your workflow.
PLAY STORE LINK