What about enabling Voice Control in Accessibility Settings? When you first 
enable the feature, it takes a couple of minutes to download the extra software 
but after that you can ask Siri to turn the feature on as required - and there 
is a voice control command to turn off voice control. Voice control commands 
can be used to replace all physical tapping and swiping and works well with or 
without VoiceOver. It is important either to use a headset or EarPods or else 
be careful to say “Command Mode”, otherwise text edit fields get filled up with 
every word you or VoiceOver say!
Harry

> On 17 Jun 2020, at 08:45, Joe Paton <patonpl...@gmail.com> wrote:
> 
> Hello.
> first a little background.
> 
> I am working with a person who suffers from ptsd after an injury caused
> by an explosion.
> apart from the psychological injuries, the physical consequences mainly,
> are that his hands shake, and navigating the touch screen is very
> dificult.
> 
> so, is it possible, and how can the touch screen be made less sensitive,
> or delayed action imposed on the device to allow location and activation
> of icons and other app elements on the screen, and within an app.
> Flicking is really dificult for him, and of course explore by touch with
> hand tremmer causes consequences that develop frustration
> We can use a bluetooth keyboard to enter data, so that is not so much of
> an issue. were there keyboard commands to navigate programs and home screens
> that would be desirable, but I can't find out if this is possible,
> so I guess not.  Guessing is of course no use at all. 
> 
> We can use siri for a number of tasks of course, but the locations where
> the device can be used may not always be condusive to dictation.
> I have looked on applevis, but in the limited time I have, I haven't
> turned up much that is solving these problems.
> There are specialised switches, so where to find out about these, there
> availability and if they would help, would be useful.
> Many thanks.
> 
> Joe
> 
> .
> 
> 
> 
> 
> 
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