Flame breath logical losses

After some time of playing with wyvern flame breath I've found some logical disadvantages:
1) With this skill wyvern is flying. Then why character cannot fly over the obstacles? Even Pounce let to jump over them, while flying with flame breath is not actually flying :(
2) Also why wyvern is affected by ground effects while character use flame breath, which is actually moves wyvern to the air?
3)Why wyvern cannot fly away from danger by using dodge roll or wing blast without interapting flame breath? Especially wing blast...

I suggest rework this moments for the sake of logic and common sense :)

and why does flying not work at all with mouse input (vs WSAD)