I would be great if specific folders like 'photos' or 'music' could have some visualization templates for the web access like à gallery for 'photos' and a player for 'music'
It's actually possible to do that yourself. There are .gif files in the web application that serves up your WHS files. I think you could replace those with other images that you like better. (I'm going to have to try that, I think!) I'm not sure how it would affect WHS though.
I'm sure that Microsoft won't offer any support for this, however, so you'll be on your own.