Well, first off, Atlanta doesn't really run a WCO - Mora himself calls it the "Alex Gibbs Offense". Some of the differences might be semantic - there are still hot throws, quick reads, and a lot of short passing - but there's also designed QB runs and a vertical passing game (more 5 and 7-step drops) and a lot of power running.
Running from the WCO is dependant on the passing game - the pass sets up the run (instead of the other way around). Since most WCO passing is short to mid yardage routes (5-10 yards), it's designed to stretch the field horizontally. The 3-step drop is the most common timing in a WCO and you see that all the time with quick outs and slants.
Big gains on passing come usually from the athleticism of the receiver - e.g. if you look at all the yardage Montana racked up with the 49'ers; you can probably attribute half of that to receivers making massive YAC. They run an 8 yard out, then turn up field for another 8 or 10.
Since short receiving patterns don't really stretch the field vertically, it's hard to keep LB's and safeties honest and work in off-tackle runs. The best plays to the outside are usually passing plays with a rollout and a dragging TE or FL.
Consequently, most of the running game is inside - by necessity it's a power running game, and that, again, relies upon the athleticism of the O-Line and the RB and coordination in blocking schemes.
With a mobile QB, however, you get something that's not really a Walsh-style WCO (The Alex Gibbs bit).. What made Steve Young and Michael Vick so successful was that they had the green-light to run. With a QB that can run, you open a bunch of possibilities - blitzing becomes super-dangerous, rollouts require disciplined defenders, broken plays are opportunities for big gains, etc.
I'm afraid Dailey had what I call the Holliday Syndrome - a good running QB forced to stay in the pocket against his own instincts. No wonder he looked frazzled at times. If the kid had more leeway to run, I suspect the offense would have been much more successful.
Now, IMHO, if BC and company were *really* clever, they would have had Adams (maybe, depending which of the other 2 QBs were the stronger passer) in at QB, and moved Dailey to Halfback with a split backfield. Imagine having to defend a sextuple-option - FB dive, QB keep, QB pitch, QB pass, HB run, HB pass - all from the same formation. Then start putting in designed rollout/sprintout passes, dragging TEs, wide-hides, FB screens, etc.
Nightmarish to defend, and probably not as huge a change from the option game (therefore an easier transition).
To paraphrase the Sprite slogan - Style is nothing, winning is everything. If the Huskers could win with the wish-bone or the T, then use it.
My $.02.
IRISH!