We're talking about 2 different things. I was referring to loading Tiled's tileset layers (with multiple tilesets each) into C2's tilemap objects via the TMX Importer at runtime. The TMX Importer was designed to use sprite objects acting as tiles, so it doesn't provide the necessary features to use tilemap objects instead. On that note, using sprites acting as tiles is horribly inefficient and hard to manage, so if you ask me, the TMX Importer should be canned.
You're talking about importing .tmx layers into tilemap objects in the editor. While that is a solution, it is a really awful workflow when you have many tilemap objects + other objects, zones, triggers, etc. in the layout that you have to account for. Again, it is merely a temporary workaround as far as I'm concerned.
Now...You might be able to load tile layers properly during runtime via XML or something, but that still doesn't justify switching to Tiled. You'll sacrifice everything C2's layout editor has to offer and have to hard-code every single objects' creation and properties, among other things. There's a lot of baggage. It's too late to do that for our game anyway; we're over 9 months in.
Besides, Ashley is almost done with this feature. We already have a single-tile pickup. I'm simply asking he also allow us to pick up multiple tiles with a marquee selection.