It just hit me while I was talking about how intel working in the game right now..... and I finally realized that it should be "monarch" option if your intel is auto-taken.

Too much freedom to give the option to the players, especially those who are anti intel.
Too restricted if you force everyone, especially those who don't use Munk

In the end it is the Monarch which has the final decision of how/what intel they wish to use for their kingdom anyway.... no way to prevent that........ so having them choose is the right choice.