We've been having some of that discussion here since the community we are launching is new.
One of the things I have to do to make this happen is involve all the rest of the organisation in the scope and concept of the community. I have presented it in a slightly different way which relates to your question.
I suggest that no-one just has a role / remit as such. We are all working towards fulfilling the goals of our team/department/organisation, but we are all doing so from a specific point of view and with certain specific accountabilities.
While I may be the Community Manager today, I am not just working on the community, but responsible for representing the community's point of view within the organisation and in all the decisions we take, and furthering the organisations goals via the community work. So I am helping with marketing, communications, social media, customer service, delivery & fulfillment, finance, etc... but seeing if there is a community angle on the issue.
In that sense, I feel empowered to be involved (to some extent) in many other aspects of the organisation, and welcome others wanting to do stuff in the community.
Then, I suppose, the question is: "What do you mean by 'the community point of view' in decisions" and in our case that would be about 'engagement with members and creating channels of communication that will ensure they are more satisfied with the organisation'
Does that help?