For instance, say I want to stat a half-drow dragon figher2/sorc6/EK4 npc. How hard can it be?
Use elite array of 15/14/13/12/10/8, add racial modifiers, assume skills are maxed out whenever possible, stat boosts from every 4 lvs to key stats. Eq can be allocated using MIC guidelines. Use average hp.
When I flip through dnd modules, I tend to mentally visualize in my mind how an npc may look like if I were to rework him (because wotc creations tend to be fairly unoptimized, so I like to rebuild them to make them better). Over time, it should get fairly intuitive.
Allocate stats as 15/14/12/8/10/13. Half dragon and drow combined modify stats as follows: +8str/+2dex/+4int/+4cha, and don't forget the 3 points from 12 class lvs (lets say I assign them to str, int and cha). So that gives me 24/16/12/13/10/18.
HP is 10+5.5+2.5*6+3.5*4+12*1, or 57. Bab is +9, base saves are +9/+3/+4. He gets 5 feats from 12 HD, +2 bonus fighter and 1 bonus EK feats. For simplicity's sake, I try to select feats which provide a constant bonus, and can thus be automatically factored into their stats, and do not require me to keep track of them, such as improved toughness, weapon focus, practiced spellcaster, the various save-boosters, maybe a regional feat like discipline.
As for eq, MIC suggests to give a cr15 npc 6 items of lvs 13, 13, 12, 11, 10, 9. This make take a little more time, but only because it is so fun to mix and match different magic items and see what works what not, so I don't really see it as a chore. Maybe belt of battle, vest of the master evoker, ring of spell battle among others.
Spells are pretty straightforward. Take some long duration buffs and assume they are always on, like mage armour and false life.
Granted, he will likely die in 1 round to a co-ordinated attack from any lv12+ party worth their salt, but hey, what do you expect from an npc cobbled together in 15 minutes mentally?
