Right now, when the tab key is pressed it is possible to configure Obsidian to enter either one tab char or 4 spaces.
Some users likely prefer to have a way to specify the number of spaces a tab key-press is converted to.
It is important to note that Obsidian does NOT support proper delimiter based indentation (that dictates a variable number of spaces for proper indentation).
Right now, indenting with anything different than 1 tab or 4 spaces will be broken.