Pseudo-0.990 Detail Textures
Quick Link: viewtopic.php?f=3&t=53#p155 (Towards the bottom of the post, right above the Palette mod)
If you're slightly impatient like I am, I found a simple setting that can re-scale surface textures to resemble the highly detailed environments in Space Engine 0.990. Towards the bottom of main-user.cfg, you can find the PlanetGenerator tag. It does NOT actually port the 0.990 terrain over! It merely resembles it!
PlanetDetailTexScale 16384 // scale of detail textures
PlanetDetailTexScale 32768 // scale of detail textures (remove cache if needed to apply changes)