So I've worked out a solution based on Dave Gifford's
example of using the SelectWidget to set fields.
The dropdown menu only appears in View Mode of course, but changes made show up in the fields in Draft Mode, so I guess it's doing what I need it too. I'd still rather the changes could only be made in Draft Mode, but this seems to work.
I now have the code below[1] to set the value field for 'probability', and a similar one to set the value for 'severity'.
My next step is to place the code for each group of values in a separate tiddler, so that I can reference them (transclude them?) into each tiddler that I require values set for. I'm doing this so I can easily change or update the values across multiple tiddlers.
Any hints or tips appreciated!
Cheers,
David.
[1]
<$select field='probability'>
<option><$action-setfield probability/>1-rarely</option>
<option><$action-setfield probability/>2-unlikely</option>
<option><$action-setfield probability/>3-sometimes</option>
<option><$action-setfield probability/>4-likely</option>
<option><$action-setfield probability/>5-frequently</option>
</$select>