Right now, with a living zabbix installation, it can be hard to know exactly what's beeing tested on a server.
the fact that some configuration information can be changed from templates is a very powerful way to customise an installation, but it makes auditing the configuration specificaly hard, as there is no way of findig default data from non default ...

I would suggest :

• adding another flag for items/triggers giving us the possibility of filtering in order to show the changed templated items /triggers graphs (of course filtering has to be implemented for triggers...). maybe the new filtering could be a 'changed template' added to the 'templated/non templated' list ?
• adding at the list and at the edit level for items/triggers/graphs a visual clue telling us that the value has been changed from the template (a '*' or different color...)