And loading from the console starts the game in multiplayer mode, right?
Only if deathmatch is "1" or higher (it usually is, but I wouldn't be surprised if it went to single player mode) I'm sure you already know this, but if it's on "0", it would be considered either Co-op or SP. Oh, and about starting a map from console: I've started MANY maps from the console, such as fragtwn6 (without the .bsp), and it worked fine. I know you can do it both ways, but from what I understand, if you type map MAP_NAME.bsp, it either looks only for the bsp files and not .way or .ENT files, or is just longer to type (maybe both). I could be wrong though. I'm neither a map maker, nor coder, but I know a bit about quake mods and how they work.