It may still be possible to have torches in the game even if night battles are removed as another daytime called sunset(which comes after evening) also uses torches. I believe that night sky images etc are hardcoded as I havent been able to find them and have been wanting to edit these myself for some time now as night skies are awful

Goth
I've been fiddling with this as well for slightly different reasons. I can see that sunset (and sunrise?) in custom battles uses torches, and I can change the daytypes so that campaign battle uses sunset settings.

by deleting out intermediate ones for a climate and changing start time, but I haven't yet been able to get torches to appear in campaign map battle without it thinking leader is in charge of night battle. Any idea what other files are involved in this?