It would be incredible to add channels to the memory cards of the extended chests and assign an IO port to a particular side of said chest. Think like the EnderIO/Thermal Foundation reconfigurable sides.

Just click the check box to change the memory card channel, and another Right Left Front Back or Up and Down for IO channel assignment.

Whatever two sides that are NOT dedicated to either channel are either default as is per current version (highlighted memory card) OR flat input/output from ALL memory cards inserted.