There's actually a small error in your *.ini explanations, MLGnom:
MLGnom wrote:
- ColumnWidth:50,25,30,25,30,25,30,25 – the widths of tracks. All numbers are separated by comma.
Sizes goes from left to right. So if you changed special button position in 8k, you need to change it here too.
WARNING! Use only 4 sizes for 4k, 5 for 5k, 6 for 6k, 7 for 7k, 8 for 8k. No more,no less than amount of tracks otherwise you will crash osu! when starting a map!
While this is correct on its own, you CAN add additional columns. Just remember that you need to add numbers to ColumnLine as well. The game only crashes if ColumnLine doesn't have exactly one more number than ColumnWidth.
Looks like this (8 columns in 7K mode, notice how the barline does not reach across the eighth row):
And a few missing functions of the *.ini:
ColourColumnLine: [color code with four variables, the last one being alpha] - Colour of the ColumnLines
Barline: 0/1 - Toggles the Barline on (1) and off (0)
ColourHold: [color code with four variables, the last one being alpha] - The colour used to tint the combo number when holding long notes (orange by default)
Tried ColourBarline, but it does nothing =(