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Hello there,As far as I know, the currently upgradable blockchain parameters, other than the protocol, are target block time, maximum block size, maximum transaction size and maximum size of metadata. You can check them here: https://www.multichain.com/blog/2018/01/second-multichain-2-0-preview-release/
However, there is a support for custom permissions via smart filters if that helps. Maybe you can implement some new permissions with new rules? here are some useful links about it: