always-option-as-meta.py

from __future__ import print_function, unicode_literals
from AppKit import NSUserDefaults

defaults = NSUserDefaults.standardUserDefaults()
nsDictionary = defaults.persistentDomainForName_("com.apple.Terminal")

mutable = dict(nsDictionary)

mutable['Window Settings'] = dict([
    (k, dict(v, useOptionAsMetaKey=1))
    for k, v
    in mutable['Window Settings'].items()
])

defaults.setPersistentDomain_forName_(mutable, "com.apple.Terminal")
defaults.synchronize()