In your case I would suggest not changing it.  If you set it back to the default of 6, I suspect you will go over the 1024 limit per pool.  Exceeding the connection limit can result in dropped connections and reduced performance, so staying under 1024 per pool is very important. 
We are using the MEM 1.1.2 driver with our ESXi 5.1 environment. We have about 7 Blade servers and using 2 nic's for iSCSI traffic. We have 4 EQ members: - PS4000 with 2 nics - PS6000 with 4 nics - PS6000 with 4 nics - PS6100 with 4 nics. What is the recommended number of volumesessions for the iscsi connections?.
Recommended number of VolumeSessions for ESXi5.1