A rather sharper response than I was expecting. It was a simple request for information about whether there's a limit to the customisation which is possible - and your answer suggests that there isn't. I have been reading the high volume of requests for changes/features and was merely wondering whether, even with time and effort, some will be impossible to provide.
I'm not demanding any features in particular, nor do I want instant changes. I fully support your endeavours in building this site and I'm content to wait and see how it develops. I'm used to systems (such as Moodle) in which programmers develop a platform and provide a CMS to allow individuals to produce an implementation with their own look and feel but can't change the underlying code.