I can think of several tasks for the dog to do, like reminding me to take medicine in the morning/evening, providing balance support when I get dizzy or light headed (vestibular problems, never get blown up haha) giving different commands like 'watch my back' to give some reassurance in public to be more trusting and not so hyper vigilant, giving a hand motion or a random word/cough/trigger to start barking and quickly a stopping command to give space in a said 'personal bubble' and turning on a light after waking up from a nightmare to orient myself and comfort before turning off a light again...etc etc...the list can go on.
Some of these may be legal tasks for some but not for others.
The dog must be trained to do something that the handler can not do for themself.
"reminding me to take medicine in the morning/evening"
In most cases
setting an alarm clock/ using an alarm on a watch allows most handlers to do this for themself. ... OR ...
If you only need a reminder in the morning or evening when you are home why would you need to take a dog whose only task is to remind at these times with you to go grocery shopping in the afternoon?
"providing balance support when I get dizzy or light headed"
Many people get dizzy or light headed for a second or two so this would only be a task if without the dog you fell or were dizzy to the point that you were unable to walk.
"giving different commands like 'watch my back' to give some reassurance in public to be more trusting and not so hyper vigilant"
This depends on what you have the dog do to "watch my back". Barking, looking threatening -- NO
. And many people are leary and hyper vigilant in certain circumstances. Apporach me in a parking lot at night and I will probably warn you not to come any closer. Only a task if you become upset enough not to function (can't breathe, can't move, can't stand) and then the dog can only do a passive non-aggressive task such as standing quietly between you and the approaching person.
"giving a hand motion or a random word/cough/trigger to start barking and quickly a stopping command to give space in a said 'personal bubble' "
A SD in public is not allowed to bark or act in any manner aggressively. See above.
"turning on a light after waking up from a nightmare to orient myself "
Only a task if the handler is not able to turn a light on
themself such as they are so fearful they can not move or they freeze and not able to think of turning on a light. If they can not turn on a light switch because they are unable to get out of bed because of mobility reasons then there are lights that can be turned on from bed such as a bed side lamp or a "clapper" type. If the dog is needed then this is a task in the home but not a resonable task to take a SD in public.
"comfort before turning off a light again*
The DOJ states "comfort" is not a task. (Comforting is a bonus) And once you reach the point that you no longer need the light on then unless you are not able to move - get out of bed or reach over to turn a bedside light off - then that is not a task for a SD.
"...etc etc...the list can go on"
You can not go through a printed list of tasks and decide training such will make your dog a SD just because you a PWD. You need to know what you can not do and need a dog to do for you
In the SD world there are what is known as a strong task, a weak task, and a bonus.
can be demonstrated in court on command. The PWD must also be able to convince a judge that it is a needed task. The judge must also be convinced that this is something that the dog was trained to do and not something that the dog does naturally.
are those that are needed but not always able to do on command.
is something that makes life more pleasant but not something that makes a dog a SD.
This is why many agencies and organizations say you need to train your dog 3 or more tasks. Some will be strong and some weak. Very few PWD have only one need.
There are also SDs that are only used in the home as they have no need to be taken into the public. These are SDs that are trained to wake the handler up in the morning and other in-home only tasks.