In the Special section, it is called the Respawn object. It doesn't preview those objects since the rest are abstract, so it's easy to miss. Edit: if you play your map from the map editor you should see the respawn points render as campfires with the blue ring. I had the same question last week. :)
I do not believe that they have announced that yet. I understand that they had a buy more foundry slots button briefly in alpha or early beta, but it was removed. Chances are they are waiting to see a few things like average usage and decide on how they are going to handle the 16k plus quests already in the works before…
User Generated Content. I usually see them on threads started by an author to gather feedback on a specific quest/campaign. There may be other conventions that I am unaware of.
You can find many of them under NPCs. You can change the skins of an existing encounter (selecting individual mobs in Detail mode) and get some of what you might be after. However, they will probably use the powers and tactics of the base encounter. I made a Dwarf rotter skin over the Hulk encounter as an experiment, for…
Note that anything attacked by a Guard is zeroed for xp gain, from what I last saw. For the stated mechanism that is fine as its a subset of mobs that your players never see; however that could really irk players unless they are just out for a good story regarding a companion.