Nope! It's all dynamic. That was just what I chose on the spot.

It'll basically add up to whatever they are, and calculate based on those weights.
Oh! Ok, cool, I'll just do it out of 100 then so it's easy to understand.
My testing with spawn9weight was interesting. Not 100% what I expected. I did notice an increase in spawns, some that could have been upwards of 9 or more, but not always.
For example, ran across a place where you'd normally fight one giant spider. There were 3. This was interesting, because I would have thought the spawn9weight option would have spawned 9 of them there...
Also ran into a spawn where it was mixed, probably because this leveled list has several things it can choose from. I had 4 frost trolls fighting 3 draugr deathlords. Was pretty cool (Still only added up to 7 though)
Is this "not quite 9" thing caused by the levelled list having a chance of being empty?
Also, suggestion for future development:
Would it be possible to dynamically adjust the spawn weights based on player level?
For example, let's say at level 1-20 we want little to no chance of spawning extras.
20-30 we'd have a fairly common chance for 2, rare chance for 3.
30-40 it goes up, more common for 2, uncommon 3, rare 4.
40-50 very common 2, common 3, uncommon 4, rare 5, rare 6, rare 7, rare 8, rare 9.
Or something like that?
Currently I'm going to input calculations based on what I think it should be at level 50, and just go with it. But it'd be awesome if the weights could change by player level.
Problem with that is it might not be doable because of the way it's done via patch and not in-game.