Support specific Ids from URL and association with any deal that isn’t the most recently modified. ChiliCal events always associate with the last modified deal, and we have no way of controlling which deal to associate the event using the smart link parameters.
We also have no ability to pull info into an invite or post information from a meeting to a custom object. We only have access to Contacts, Companies, and Deals.

Not only will this let us specify which deal we want associated with each meeting invite, but it will enable us to associate the meeting with a custom object