Datamining across stakes is currently not possible.
Your can only handle this by using different windows accounts.
E.g. datamine 1/2 with your usual windows account,
and create an extra windows account for datamining 2/4.
But i am not sure if you can run 2 instances of a iPoker skin from the same computer in different windows accounts.
A small guide on such a setting can be found here for SpadeEye. But the idea might also work with iPoker:
http://www.spadeit.com/guide.php#more