John,

this is the value of the trim handle. By resetting it, if you become
momentarily distracted, you are less likely to let the nose float up.

As you may have no choice in the direction you thermal, you may not
have a choice in the direction of your pattern.

You should be able to transition from climb to cruise and maintain a
speed, regardless what that speed is and your altitude. This is basic
airmanship. If you find this difficult, get help.

Stall spin in the pattern is typically due to poor pattern planning,
often leading to skidded turns at low altitude. And while you must
stall to spin, you will not spin if the you maintain coordinated
controls. This is why your instructor repeatedly told you to check
airspeed and yaw string while flying in the pattern. Down low this is
of paramount importance. There is simply no room for error. Again,
basic airmanship.

You are rationalizing a crutch. Learn not to be distracted. Deal with
problems, but don't let problems create bigger ones by letting your
focus wander from the task at hand -- flying your aircraft.