Okay so I actually figured something out that was really easy!
Your code is super clean.
I am still a noob at sharing code, but here is the logic of what I did.
Basically in your core plugin you you have a $placemark array and one of the items is an ID, so all I did was go to your main javascript file, and add the ‘id’ to the to the marker creation array. Then when a user clicks a marker I can trigger and event and use this id to call related post information!
Awesome plugin!
I guess to make this general case for all I would have to make it an on off option… anyway very cool stuff!