Light Timer (Freeware. Copyright D.Stuart 1998).
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No bells or whistles, just a very simple utility to
disable the backlight timer on a Psion Series 5. This is
particularly useful when using external power and
working in a darkened environment, as I often do.
Setting the timer to 00:00 disables the timer and the
backlight stays on until the machine is switched off.

Let's hope that such a facility is included in the next
version of Series 5 ROM.

The files associated with Light Timer can be freely
copied and distributed intact and unchanged. No charge
must made for any such copying or distribution.

Installation.
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Create a folder in /System/Apps called Light Timer. 
(Make sure that the System folder is visible. If not,
press Ctrl+K in the system screen and select Show
'System' folder from the Preferences dialogue).
Copy the files Light Timer.app and Light timer.aif into
the new folder. The extras bar will now include the
Light Timer application.

Operation.
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To switch the backlight timer off, simply run the
application and press enter. The timer setting defaults
to 00:00 switching the timer off (not allowed in the
normal system screen setting). If the system screen
control panel screen dialogue is subsequently opened,
the timer will default to 3:00 minutes. The maximum
allowable setting in Light Timer is also 3:00 minutes.

Disclaimer.
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Light Timer has been fully tested, but no responsibility
is accepted for any loss or damage caused by the use of
the software.