To be honest, if you don't specify a scope the setting will be DEFAULT, or "global-local" in Vim's jargon (see the Vim doc). IMHO "global-local" is prefered over a global- or local-scoped setting as those will allow the user to set both a value for the current editor AND set a default for a new editor.

Vim doesn't implement all too much settings which these scope, but they do say this in the docs:

> Note: In the future more global options can be made global-local.  Using ":setlocal" on a global option might work differently then.

So unless there are settings which are really global (maybe 'contentassistmode' or 'clipboard' which I'm working on in a local branch) or local ('modifiable', as you're unlikely to set your editors to readonly by default), I would leave most settings as they are.

If you think some others still need changing, feel free to list them.