Well, perhaps "fault" is too strong a word, rather not as refined as others...
Sure, some planes require attention to the pedals with other control inputs. The ball indicator in the T&B/TC will always be right (unless it's simply not working at all). So, unless to intend uncoordinated flight, use the pedals to keep the ball in the middle. You can research aileron design, as there is lots to know about adverse yaw, which can occur when ailerons are applied, and yaw the airplane counter to the intended direction of turn. Really well designed ailerons don't do this (much). Read up on "frise ailerons", then observe if your plane has this design feature. In any case you'll get the idea.If the plane is STOL because of the installation of a STOL kit, yes, these do change the relationship of rudder to ailerons, and you'll need to use more rudder all the time. Get use to it, it's a very good habit anyway!
Now, to a more basic point - safety. STOL stands for "Short takeoff and landing". Sure, do that. However, it does not, and should, not stand for, nor inspire needless slow flight, particularly at lower altitudes. Yes, "STOL" planes (and I've flown dozens of types, and owned one for 33 years) are more capable of flying at slower speeds, and higher angles of attack. But they are no more capable of gliding and power off landings at these slower speeds, that is the same as the base plane. So, if you have a STOL kitted Cessna, for example, yes, it'll get off the ground in a shorter distance, and at a slower speed, excellent! But, to maintain the safety you have come to expect, allow it to accelerate in ground effect, and climb away at book speeds. Sure, if you have to clear an obstacle, do that. But understand that the plane can fly so slowly that in the event of an engine failure, it will not be possible to enter a useful glide, and make a power off landing before simply impacting the ground in a stall. Because if the engine stops in a "STOL" climb (or even slow flight), you're already flying more slowly that the ideal glide speed for the plane. You'll have to shove the nose down, and accelerate, just to get to glide speed, then glide to flare and land. By the time that all happens, you may have already reached the ground in a clump. If you have a Robertson STOL Cessna, the Robertson Flight Manual Supplement provides some warning words about this - take them seriously!
So, whatever the published glide speed for the plane is, fly at least that fast as often as you're able, knowing that if you're slower, a safe power off landing is not assured.