I would like to also express my interest for such a feature.
The use case is a forum built for a school, where each class has its own category and we would like to maintain a calendar in a topic, where everyone can add some entry be replying to the topic and using the “insert date”.
Contrary to the Create event dialog where you can specify an end date, the Insert date / time dialog does not have the option to specify an end date.
I’m crossing my fingers but I’m not sure if this is a common request given that we are only 2 on this topic.