I was hoping until the very end that you were just kidding, and I decided to, so to speak, support you;)
And TEditor is just a visually-辅助 program for rmg.txt, and it cannot actually add columns or anything else to it. In the rmg.txt file, you can only set parameters (interval and density) for three types of treasures. And in TEditor, you can simply set these intervals and densities for each of the three types in an adapted (for blondes) format - in text format, so you don't have to type in numbers.