[development] custom notification system

[Aldo Martinez Selleras]

I'm working on a system developed in drupal.
In this system create trophies to be assigned to users according to the 
behavior of these in different ways. Trophies will have categories related 
to aspects.
I need each time you create one of these categories will send a notification 
to the user webmaster and this will give permission to be believed or not 
the proposed category.
The problem I see is that all these modules I created without using 
precisely the nodes in drupal, I mean, use separate tables, and I think that 
the application of the actions and triggers will not adequate as i need, 
using the hook_nodeapi.
Someone can give me any suggestions on how we could create a notifications 
system that meets my expectations?