Hi Gavin,
I was working on the same, by using manage space users.
But I have this weird problem the users which are given access to specific folder as "Consumer" have rights to even add content and all the options in more options.
Users who are consumers in the company space dont have all the options.
Also when you assign a user to a specific space, when he signs in he goes to that particular folder, but if he clicks on the company home he can access all the other folders, so the purpose is not solved.
Does manage space users have any other settings which I may be missing out.
Need your help in this.
Thanks
Akshaya