Did you update to latest version (v1.1.15)? There is a new map type (Section Map) which does exactly what you're looking for: using full rooms prefabs! :)

It's on the AssetStore now :)

As for the door problem, we'll look into it and let you know!

Hi, we are currently working on the Unity 5 version of Daedalus. It should be ready in a few days.

There will be a lot of new features and fixes in the next update; for example, a "Force Room Transversal" option, which will create a better path for the dungeons. Also, new map types are coming: Section Maps and Oriented Section Maps. The first will allow you to use whole custom prefab rooms as tiles, while the latter (expanding from this) will be more suitable for 2D/2.5D games.

In a later update (not the next one), a different algorithm with BSP map generation is coming, which will create totally different-looking dungeons.

You're welcome! Let us know if you need to know something else.

Yes, of course it's grid-based, so if you're using modular stuff it should be easy to do what you say.

Well, as of now, that's the best you can get with GetObjectsOfType, but given that your prefab is a whole room, you could just put an empty GO or something like that in the left corner of the room; how does that sound?

You can have a look here for a list of all of the exposed methods; in your specific case, you could use GetObjectsOfType(SelectionObjectType type)