Functional overlays

Hi, I'm an original backer of this project but I never really used Dungeon Alchemist thoroughly until now.
I was trying to make a Sewer map and while the end result was pretty gorgeous, I had to get around some limitations of the tools I had at my disposal. I'm about to make separate requests for each one of them.

I wanted to add labels to my map to identify each room, but what is actually available in the game is a bit "too invasive". I want to have the possibility to add semi-transparent plain text (no frame, no stickers, just letters or lines of text) to each room.
Also, I would like to have the chance to delimit areas that are considered difficult terrain or solid obstacles. For instance, I had a bunch of stalagmites in my map, which players are not supposed to be able to move through. I would like to "isolate" those areas with dashed, dotted or continuous, semi-transparent lines.
Lastly, using the "overlays" mechanic, I would like to be able to add markers to my map, like arrows, crosses and stuff.