No, /L can't behave like /Q without breaking backwards compatibility.
/Q will only work without quotes if you have no whitespace in your arguments.
Your examples cannot work unless DO has a custom parser. There's no way for a general-purpose parser to know that sometimes your options are options, and sometimes your options are arguments, and only you know the difference.
Nothing unexpected there -- some options (like /C, /P, and /Q) are only valid if they're at the beginning of the command.
Your /L /L is interpreted as a single option that you inexplicably repeated. It's not the parser's job to make assumptions about what you might have intended, and in fact this is a fairly common occurrence with aliases.
And the /O:x is processed and removed before the /L is processed.