Yes, wing buffet can be a cone of a moderately more powerful physical attack. But for the points you'd put in to increase it's range you have a lot of better choices since you other tools dealing a cone's worth of attack than wing buffet if a cone's single attack is all it has going for it. It's great for the one point you put in, sure. But more than one, I really wouldn't bother, personally. The knockback is the *point* of the skill, and if the knockback isn't something you need or can use, then the skill should not be invested in heavily.
No there aren't. Ice claw maxes out at the range wing buffet starts at. Max range wing buffet is available as early as level 3. Breaths don't start up until level 12. And it's not a moderate power attack. My last wyrmic winner averaged 598 damage per hit not counting crits or procs with Wing Buffet. He did 637.59 with fire breath. His physical crit rate was 63% compared to mental 55%. With a 1.9x crit multiplier that comes to 937.07 for wing buffet and 999.10 accounting for crits. But then there are procs. 20% chance to gain 10% of a turn off of randart boots. 17 light 20 temporal off of randart gauntlets. 35% chance to blind, 41% chance to corrode armor, 4 acid, and 8 fire off a randart ring. Another 15% chance to corrode armor off a randart amulet. And a 50% chance of dealing 326.04-978.12 damage in radius 1 because the rotting titan almost always drops the blighted maul, but even without that the damage gap is less than 2% just from other randarts and the debuffs are better.
Even with a less extreme weapon a decent tier 5 with the random weird melee procs you get from randarts will outperform a non-DoT breath. But both of my two handed wyrmics to reach high peak used the blighted maul and I didn't have the item vault yet for either of them. It's not exactly rare since it's linked to a unique monster. The other took cold drake aspect and spent the whole game wishing ice claw were as good as wing buffet.