Yeah, it could be but I want to visit changing the API itself.  I'm not sure we need to use ```/api/custom_info/systems/<id>/<keyName>``` since each custom info object has a primary key id.

I propose the API be: 
 GET ```/api/custom_info/<id>```
 PUT ```/api/custom_info/<id>```
 DELETE ```/api/custom_info/<id>```
 POST ```/api/custom_info/``` with the "informable type/id in the post data"

@komidore64