I do not know if you are thinking of the same mod, but you could try out Plutomans ASIS mod. It allows you to exclude creatures...if you know how the author named them. You should have no problem with finding those out.
At the moment you can only download ASIS by means of a dropbox link in the thread for ASIS on the Beth forums. And the latest version can be downloaded from post 69 in that thread.
http://forums.bethsoft.com/topic/136887 ... -thread-3/
I use it myself and you may remember a screenshot of my character with a whole lot of dead Dremora. Plutoman gave me the following advice...
After i lowered options 4 and 5 to 0 with my new version of Corael, i have not encountered such huge groups. ( So far. )Hmm, that doesn't make sense to me, as SkyMoMod uses vanilla spawn points, afaik... You might have just hit the astronomical odds and had a double 5 spawn? An easy solution to that is to lower the 4 and 5 options to 0 - or if you still want those chances, but to be lower, double the spawn 0, double the spawn 1, and do like, 1.5x the spawn 2. That would dramatically reduce the high end chances.
BTW that is a cute dog as your Avatar.