If you present the loop and roll as a "requirement" and let them figure out how to deal with it, then it's stressful and a "bad thing".

If you just say "hey, how about doing a loop this flight?" and telling them how, it's a fun thing thrown in to releive the "boredom" of flying in the same box pattern over and over. Same with the roll. I want to see some kind of upside down acrobatics, but I don't make a big deal out of it, I just teach it along the way. Heck, most students ask how to do them anyway.

My club does require three "simulated dead sticks" with the engine set to idle by the instructor when they aren't expecting it. The first, I make easy, lots of altitude, good location, etc. The last, I make harder, sometimes I make it impossible to reach the field, I let the student set up for an off-field bush landing, then power out of it. I use it to teach the "ok, you aren't going to make it, now what" type thinking.

We also require take off and landing from both directions. I like to see, but don't require at least a little cross-wind flying, since it's common at my field. (really, it's not common for a student to do enough approaches and landings to be comfortable with out doing it in a crosswind at least some around here).