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Sorry for the late reply. I took some courses for the summer which has me pretty busy lately.

Events triggering on mouse click is actually a built-in function of RPG Maker though my plugin does allow you to remap activation from the default left-click activation to right-click. It would be pretty easy to add an plugin option to completely disable event activation by mouse click honestly. I could make that part of the next update.

 As far as making only specific maps and/or events compatible with the added systems, you can disable the  "Drag & Drop Maps" plugin option to prevent all maps from being drag & drop ready by default. A that point you'd either have to setup the default dropzones for your current map or create custom dropzones for your current map through a script call. I could probably simplify the process for those who want to use default dropzones but only on specific maps by adding a new event tag such as <dropMap> which could call the required function automatically for the map it's on.

For events, you can disable the event related plugin options to make events neither draggable nor detectable on hover. At that point you could make specific events draggable, hidden, through the corresponding event tags. If you wanted to go the opposite route and make only specific events ignored by the system, then you could make use of the <invalid> event tag which makes events treated as if they don't physically exist on the map in terms of drag & drop, hover detection, & collision detection. Using the <hidden> event tag would allow you to make events invisible to hover detection but still draggable and subject to collision which is helpful if you need the player to find & interact with an event on the map with no visible mouse indication of where it is.