defaulting input variable for a flow service

Hi All,

We are calling web services through IS which has some mandatory input variables which always expect the value to be true . So each time we generate the WSD for a web service we have to go into each flow service and set this value as true as such parameters keep on adding.

Is there any way to set an input parameter or a variable in a doc type to default to a particular value. So, if I have Input called as EndOfVersion and want it to be set as true always, is there any way other than setting the value in the pipeline?