I have noticed this trend as well, with people strategically choosing courses to maximize GPA. While there is nothing technically wrong with what they are doing, I too feel that those who choose to take on more challenging programmes/course-loads should be awarded as such. Just looking at numerical GPA doesn't really tell of student's academic prowess. I know PIs look at courses taken when selecting students for graduate studies, so why not do it when considering entrance into Medicine.
UofA have started checking almost all EC verifiers last application via an E-mail form. I think is a good move and will prevent people from stretching the truth, if combined with the requirement that all verifier emails be organizational e-mail addresses (as does Calgary). However this doesn't make it foolproof, it just makes it very hard to spoof.