Why would we need a C-Frame tool when the owner can easily go into edit mode, insert a C-Frame tool into StarterPack and babam! You have yourself a C-Frame tool.
No support, not needed.
There are many different ones, creating a new one may be hard to get used to. Not to mention the one in studio only goes 45°! I would love if they made one where you can type in the angle you want.