Is an Aileron Roll Easier Done Opposite The Rotation Of The Plane's Propeller? We all know helicopters have tail rotors because they would spin out of control thanks to Newton's third law.

That got me thinking, would a single propeller plane have an easier time doing an Aileron roll opposite the rotation of the propeller? And do light aircraft require any special tricks like having one wing longer than the other or the ailerons being tilted in the rest position?

To be clear, I really don't know any more about aviation than the average person. The question just crossed my mind and I didn't find anything googling around.
Yes: Rolling one direction easier than the other, as you mentioned, newton's laws are at work here.

Special Tricks? Also Yes.  There are several design strategies to deal with asymmetries of thrust from propellers.  Bear in mind that these thrust asymmetries are not always at work, so any design feature is a trade off.  The propeller must be running, angle of attack is a factor, etc.  I have heard of asymmetrical wing incidence used, but more often a slight offset of a tail-plane, such as the vertical stabilizer is used.