What determines how many nasties you're facing?

Does your class or alignment have any affect on the number/type of spawn or the type of drops you get?

I know your level relative to the dungeon is the most determining factor, that is, when you're getting the least xp/individual monster you get the most monsters & drops (farming) until finally you're getting no xp/drops.

Lat night I was reminded that getting full cash value for drops IN THE BAG is awesome (haha, too bad, Marty) UNTIL you become a Templar.

No. I use my own monster spawn script that has nothing whatsoever to do with the standard NWN spawn trigger system. Your class and alignment do not affect the numbers spawned. It's based on the number of hit dice in your party who are in the immediate area versus the level of monsters spawned. There's also a random effect, so you can spawn a greater number or more powerful monsters.

I have a friend who thinks that evil chars get rougher spawns, and it kinda seemed that way for a bit last night, but I was relatively over-leveled for the areas since I was powering through just trying out spells on different monsters.

Making things more difficult for evil characters does sound like something I would program into the module, but in the case of monsters spawns, nope. I didn't do it.