What kind of support? As far as I know, model maker is an UML tool to help you design classes, am I correct? If yes then you can safely use it to create your entity classes. I'm interested to hear what kind of integration you would expect.
I was working with InstantObjects in the past and they had pretty good integration with model maker. You could create entities and relations in modelmaker.
Ok, but I believe you can do that with Aurelius as well? It's just pure classes, maybe InstantObjects needed some specific integration.