Does Multisite privacy have to use persistent cookies?

Hi, by default we have multi-site privacy network activated, however I recently discovered it uses persistent (albeit half an hour ) cookies.

With the EU cookie law, generally we try and avoid cookies on sites that don't need it (then there is no compliance issue )

Obviously we can not network activate MSP and just activate it as required.

But is there anyway that this can be coded to be cookieless.

I looked at the code and it baffled me, so I can't make any suggestions.