Spot editing a YAML document

Has anyone given any thought to how best to "spot edit" a YAML
document? What I mean by that is, lets say we have a document:

  ---
  project: foo
  version: 0.0.1
  status: beta
  description:
    Just a Foo program.
    Does nothing whatsoever.

Now say I want to bump the version field via a script. Normally I
would have to load the whole document, change the field, then re-emit
it back to the file. What happens during this round-trip, of course,
is we loose the layout and get something like:

  ---
  status: beta
  project: foo
  description: This is just a foo program. It does nothing whatsoever.
  version: 0.0.1

But I need to be able to change version, or whatever field, without
disrupting the entire layout of the file. The reason is the files I
use are often hand edited and I want to respect the users layout
preferences.

Does the YAML specification in some way make this feasible?

Thanks,
T.

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