Custom wcf binding OrganizationServiceContext

Hi All, 

I was wondering if it is possible to add a custom wcf binding to the organizationServiceContext. I created an application which has complex logic and creates/updates a lot of records. Therefore I used multithreading by putting some code in a parallel foreach loop. However after a while I get an error: Too many active security negotiations or secure conversations. 

Normally this can be solved by using a custom wcf binding and increasing the maxPendingSessions to a higher number than the default 128. However how can this be done for the organizationServiceContext or is this impossible?