Hi, 
I was wondering if there is a way to add some kind of equirectangular texture with constellations drawings (such as Hevelius and from other cultures) as in Stellarium. 
I saw a parameter in main-user.cfg such as  Of course I immediately tried to put it to true but nothing happened, so I guess this is a Work In Progress. In objects you can choose to make appear constellations lines, boundaries and names but there's no checkbox for drawings (yet). 
So is there a way we can make a mod that would point to a certain 360 texture with the drawings and stay fixed to the celestial sphere as well as the boundaries (and unlike lines that get stretched if you travel to another star system)? 
Or the other way around could be to add individual textures for each constellation defined by positions of its corners in terms of equatorial coordinates as it seems boundaries ar defined for each segments based on the equatorial grid.  

This is actually intended for such constellation images. But it is not yet fully implemented.