We do appreciate the feedback as it helps us in future development of this project. Here are a couple of notes regarding the project that may help meet your needs.
The V-Shell is not currently made to be a replacement for the Core Interface, but currently an optional addon that will allow users more easily customize the look and feel of their own interface.
All page formatting is controlled with a single CSS stylesheet. Options such as font-size, text-alignment, an color-schemes can all be modified per install to better meet a user's preference.
Currently, if basic authentication is used, the V-Shell pull access information from the cgi.cfg file and displays menu items according to the permissions specified for Nagios Core. Yes, there are differences and limitations currently, as there is no host or service filtering based who is a contact. This is set to be a future development for this project, and we're hoping for some interest from the community to help develop this project further.
This interface may not meet everyone's tastes or interests, and that's ok. This is why we recommend users pick their front end based on their own tastes and needs for an interface. http://www.nagios.org/download/frontends/