--output-node-indent that takes a value?

[IgorEisberg]

Hi there. Thank you for the great tool.
I'd like to refactor the indentation in the output file, but looking at the source, looks like --output-node-indent is hardcoded to 2 spaces, while the standard in the files I'm modifying is 4 spaces.
Is it possible to make it take a value (optional with default being 2?), e.g. --output-node-indent=[int], that would change the number of spaces being written?