I don't think there is any way automatically sort objects in the event editor in the current build. I haven't heard of it as a feature for build 294, but we can hope. You could also suggest it to Clickteam.
In terms of sorting objects by type, there is one trick you could try:
* Use the menu and select 'Object filters' to filter by type of object. You can filter by all but one object type to just show that type.
* If you then create a new object folder and drag all objects of that type into that folder. Yes you will have to move them one at a time. Once you are done you can show all objects.
* If you move an object into a folder and collapse the folder, if you drag the folder then expand it then all the objects in the folder will be moved.