new regent nullifying other emissary actions

[Cipher]

Here you go then -

Yes, becoming regent should be (and is) the sole action for an emissary, but is (and should be) allowed if the emissary has already performed an action.

The value in effecting any change around this is so far below the cost associated with making the changes that even if it made it to the development list, other items would always take precedence/priority.