It would be really nice if there was an option to set the editor inventory size to always be 54. I would like to add a custom background to the inventory and there is no way to distinguish between the two sizes. This could be a config option or you could add a separate editor title in the lang file for smaller inventories that way we can assign different glyph's to each inventory size.

Editor with 54 slots:

Editor with 45 slots:

I found out you can use #InventoryOpenEvent.titleOverride() to detect if the inventory is a certain number and then change the title accordingly. I'm currently using this, but this would be a nice feature to have for server owners that don't know plugin dev and still want to customize their editor menu.