Suggestion: textures
can you add more textures? like snow and autumn textures and props
Neat idea. I'd always planned to add seasonal content, but the mapping community has been very slow. Maybe recent events will make it feasible again.
im mapper Angel

and i made russian localization

as models, you can add a snowman or Christmas tree
and to make x-mas uniforms
and one more thing, can you make invisible texture which will not be rendered? In some cases, it would help to process less surfaces.

as I understand every brush viewed as a separate object in the world, for exemple the pillar has a lower and upper surfaces that are not needed render, less surfaces - less shadow on the unnecessary surfaces (as I understandDodgy)