Set Default Value for Input Control via REST v2

[cgriefer]

Hey all... 

We're using the REST v2 API to dynamically create customer reports. That all works fine. 

I'm trying to get one of the input controls (a dropdown) to display a default value. 

I've used "Setting Input Control Values" call, which seems to work fine according to the response:

{"selected":false,"label":"Lions","value":"579"},{"selected":true,"label":"Tigers","value":"695"},{"selected":false,"label":"Bears","value":"11409"}[/code]

As you can see, "Tigers" is now set to `"selected":true`. 

But when I run the report, there's no default selected option in the dropdown. 

And if I call the "Listing Input Control Values" endpoint, it shows that the option is no longer selected.

        <option>          <label>Lions</label>          <selected>false</selected>          <value>579</value>        </option>        <option>          <label>Tigers</label>          <selected>false</selected>          <value>695</value>        </option>        <option>          <label>Bears</label>          <selected>false</selected>          <value>11409</value>        </option>[/code]

I've been able to do it by modifying the jrxml manually. e.g. changing

<defaultValueExpression><![CDATA[]]></defaultValueExpression>

to:

<defaultValueExpression><![CDATA["695"]]></defaultValueExpression>

But we're trying to automate this process. I can't manually touch the .jrxml for each account. 

Is there a way using the REST endpoints to set a default value for an input control in a report and have it persist?

Thanks in advance!