[Orgmode] Property Drawer question

[Bernt Hansen]

Hi Carsten and list,

I'm starting to play with property drawers and I am thinking this would
be a good place to store estimated durations for tasks with something
like

* Task 1
  :PROPERTIES:
  :time: 10m
  :END:

I'd like to define :time_ALL: globally since my estimated task durations
always fit into a set of values I'd like to share across all my org-mode
buffers.

I'd like to globally set up

  :time_ALL: 10m 30m 1h 2h 4h 6h 12h 18h 24h 30h

so I can just use S-left and S-right to change the value for any task in
any org-mode buffer to select the appropriate estimated time for the
task.

I would prefer not to have to set this same :time_ALL: value in all of
my level 1 headers in each of my org-mode buffers since that is a lot of
duplication and this value is always the same -- if I ever want to
change the value I'll want it to apply globally across all of my
org-mode buffers.

Is there a way to do this?

Also I'd like org-insert-property-drawer to always have this :time: 10m
default entry when new property drawers are created.  Is there a way to
specify the drawer template somehow?

Regards,
Bernt