Write-permissions in Cloud.KeyValue and Question for Cloud Database

Hi Forum, I'm playing around with Ti.Cloud. I'm just a bit confused because with the following code the first user I created could write a keyvalue but the second user is not allowed:

Cloud.KeyValues.set({
    name: 'welcome_message',
    value: 'Welcome to Appcelerator Cloud Services User 2'
}, function (e) {
    if (e.success) {
        alert('Success');
    } else {
        alert('Error:\n' +
            ((e.error && e.message) || JSON.stringify(e)));
    }
});

How does it work with the rights?

I wanted to know if there are different values in same keys for every user but reading the keys, with different users logged in, gave me the answer.

So I'll come to my second question: Is there any workaround for a cloud-database?

I'd like to see some properties of Cloud-Friends, that I'd like to define by myself (something like favorite places, favorite cars, favorite meals etc…)