Hello,
I'm an independent web developer, I have worked on some Volusion stores before, it has involved adding features not easily handled by the platform. While Volusion has a good number of attractive features, developers have a hard time adding things to it.
I need to clarify that so far I haven't handled the management part and initial setup, but I have worked on the 'one page' template system that it has. Still I don't see it as a problem, I don't charge any time I spend grasping new concepts anyway.
If you have any question feel free to ask away, I'd be happy to help out :)
Regards