Welcome jawbon83.
You have the right idea when it comes to sharing missions between agencies, in most cases "Sharing" is the way to go. Currently "sharing" doesn't transfer or copy your mission from your teams account into another teams account. A "share" is just that, a share into your teams mission. If another agency needs their own version of the mission, you always have the option of exporting things like map data so they can import it into their mission.
There has been several discussions regarding mutli-agency interaction inside Mission Manager. Mission Manager tries to find the balance between security and operations between agencies.
Great news you will be recommending MM for state wide use. Happy to say, MM seems to have become the standard in several states already. We are even starting to get some attention at the federal level. The more agencies that use MM, the more opportunity there is for multi-agency sharing. You can assist MM, by helping us getting noticed by other agencies and at those higher levels
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