Navmesh?
So far, I have 35-ish mods installed. Most of them are to work around a few things in the game that I find annoying.
For instance, a mod automatically takes gold and lockpicks from containers. Another adds a tag to skillbooks showing what skill they affect, and also unread books glow blue on shelves. I have the mod for summoning an ethereal horse. Arrow crafting. Ebony mail as light armor, ...
Most of them are rather tweaks than real mods, I suppose. However, when I start a new character type I'll get some mods regarding skills and stuff as well. I want to play a 'pure' class, such as pure melee or magic. So far I've been doing a summoning rogue guy
If I end up with a berserker, I'll definetely get that decapitation mod. In case of magic, probably Midas Magic or something similar