Dark frames with dslr

I currently have a canon 450D that I want to use to do some wide field(18mm) Milky Way images and have a few questions.

The first question is should I bother taking dark frames? I’ve recently learned that with my asi533mc pro I don’t need to take darks as it doesn’t have amp glow, does the same apply to my canon as it also doesn’t have amp glow?

How good would my tracking have to be? Should I rig my guide scope up aswell or will the unguided tracking of my SA GTI be good enough for a 5 min exposure?