I would much rather summon and search for the new IDs in-game and write them down to place them on the map,
you can certainly map with 9.1 stuff this way, it may be difficult and time consuming, but it sure hell beats waiting for a 9.1 complete and working version of a mapeditor.
For example, if you want to use a new 9.1 item in the mapeditor, you'd have to find it in the game.
So, if I wanted to place elemental spikes in the map, I'd have to search for it by using the create item command (/i) and search for it, in this case, I found it and the ID is 13940.
Then I go to Raw -> Others, scroll down to the black squares and look for a square with the ID 13940 (can use search function too) and tada, place it anywhere on the map.
Trust me, I know what I'm doing, 9.1 works, even with the new objects, it just takes some time, but once you get used to it, it will be a piece of cake.
Hope this will help other people until Fallen finishes his map editor.
