config update templated files via charm

Hello there,

I wonder why it isn't possible to update config files which are templated in several charms.
Sometimes i have to patch the config files my self now because the charm doesn't allow it.
This also means that i have to patch the template file located in on those units, and if i add a new unit i have to patch those again.

For example, the neutron-gateway charm has a /etc/nova/nova.conf file which can't be updated via the charm it self.

Also, if i need to add values to something else then the [DEFAUL] section, this isn't possible.

Can this be fixed somehow, this is a big show-stopper for automation from my point of view.

Thx,

Mathijs van Veluw
Fairbanks.