Opt-Out cookie on multiple Piwik servers

Hey there,
first of all very good work to the programmers!

And now my question:
we are using Piwik not on one server for some reasons. So now we want to have one Opt-Out cookie for all piwik installations because some visitors may be confused to be on one page opt-in and on other opt-out. Is there a chance to set the opt-out domain from all piwik server to the second level domain?

best regards

Not possible, please use only one piwik server if possible