Yes, "no nat-control" is available on FWSM from version 3.1.1.
You just have to make sure that there is no NAT statement at all on your FWSM, and also you will need to configure ACL on all interface to allow the traffic through.
If you don't need any NATing at all on the FWSM, then "no nat-control" is your friend, and assuming that this is in single context mode.