Feature Request: Allow for different prompt char customization for root

[rinkimekari]

Currently I have customized my prompt for my user to my liking I imagine you can see the problem that happens when i switch to root. I can set the BULLETTRAIN_PROMPT_ROOT variable to false, but that only makes the prompt the same as the user. I would like to have distinction between the user and root prompts, hence me making this issue.

Any and all help is appreciated!