Adding extra icons in Nagvis


I have Nagvis working with Nagios to give better little representations of my networks right now.
Only thing I want to improve are the icons, I have been creating my own so far… but according to Nagvis they only have room for exactly 11 icons in each ‘set’:

I want to be able to have different icons per device, for example a different ‘state ok’ icon for servers, switches, routers, depending on what device it is.
Currently all I can have 2 different icons for ‘state ok’ one for hosts and one for services.

Does anyone know how or where to reconfigure nagvis to enable extra icons to be added as such?

Feel free to ask me to clarify further, I explained as best I could.