pkcs11 library shutdown

I notice in the pkcs11 interface code there is no support for closing down 
a pkcs11 sessions when a CSM_Applogin is destroyed (or indeed to unload the 
library)..
I have built a sm_pkcs11Free3 variant on Solaris.
Am I likely to be able to achieve this with the structure of the code as it 
now stands (I am aware that the the pkcs11 implementation is very much a 
first cut).

regards, David Lamkin