cool

You can find the textures for the walls when you unpack resources and go to doodads/walls/ and for each map there is a dst.pgn texture file that can be edited to have a markers for just breakable walls.
I will play around with this and when I find time I will try to make a mod on workshop, if no one else does...

I am not sure where the stuff is for the map though, would be nice to have a marker for this as well.

Damn, this is trickier than i thought...

The dev (yes, singular) recently said in one of the pinned threads that mod support is being worked on, so hopefully soon (next update maybe) it will become easier to do.

I looked at the mod for the previous game and how it was made, I think I have a clue.
I might post it today if I make it work :D

I made an architect effect that breaks every crate and vase and it opens up secrets. I find it far more interesting than having a breakable wall drawn bright purple :D

Just need to wait until modding support rolls out