

While you are at it, might concentrate on defects of certain fs you don’t like. Personally I hate the NTFS path length limit. XFS handles it much better overall but individual file names are much more limited because nobody thought about Unicode.
Also you could probably fork some fs like XFS.
Maybe unrelated but consider vertical tabs, with Sidebery. It’ll let you you scroll through tabs easier and you won’t lose much space for titles due to tabs amount.