Public parameters - caching

Since public parameters are supplied with each 
getMarkup/pbia/handleEvents request, isn't there a need to let Producers 
to store these values in the session (just like URL templates and user 
profile items), and let Consumers supply these values once per session? 
This will be a nice performance optimization.

I did not find any references to this issue in the interfaces SC docs. 
Has this issue been discussed previously?

Regards,

Subbu