Hi there,
First of all, thanks for your feedback, it's always pleasant to have positive returns on our work .
About your suggestions, here is what I can say:
a - We are working on a new Hikashop website and we spend a LOT of time to improve the documentation (new screenshots, better organizations, tutorials included in each features' documentation...) so I hope you'll appreciate this when it comes out
b - It's an interesting idea, we already tried to implement as much features and display as possible but it could be great for customers to have a completely different website. However the current one is already presenting quite a lot of features so it won't be a priority
c - Same answer as a, the new documentation will be organized in different categories like "tutorials", "shipping methods", 'begin with Hikashop" and will propose a dynamic search on the page to easily find what you are looking for. Modules and menus aren't easy to understand, we'll try to focus on this.
I hope you will enjoy this site. If you any question, do not hesitate