open user control panel or system preferences

This can already be achieved by creating and uploading a .bat script to the toolbox.

Just create a .bat file with the following content:

To open control panel

start control.exe

To open services

start mmc.exe services.msc

Upload it to the toolbox and it can be run either from the host client or the web UI.

Alternatively, you can achieve this functionality with the command toolbox extension, built for this use case: https://docs.connectwise.com/ConnectWise_Control_Documentation/Supported_extensions/Productivity/Command_Toolbox

I'm afraid I can't see the reason for adding this feature as a standalone tool. It's too specific, can be implemented via the above methods (which can be adapted to practically any system utility such as taskmgr, regedit etc), and doesn't serve any purpose if you're primarily supporting other operating systems.