>
> obviously if only one tiddler in your file contains a particular field 
> value, e.g., [myfieldname[fieldvalue*1*]], if you use your radio button 
> to change that tiddler's field value to [myfieldname[fieldvalue*2*]], 
> then fieldvalue*1 *will no longer appear as an option in the radio button 
> list.
>

Yes, that is true... at which point your ui should also provide a way to 
add a yet undefined new "type".
 

> For my use case, I found I still needed to create "placeholder" tiddlers 
> containing the fieldvalues that I wanted to be always available for 
> selection.
>

I would think for most usecases it is the best approach to define the 
options in a precise spot, rather than take them from existing values. 
However, selecting anything via radio-buttons does not necessarily mean to 
change any of the tiddlers from which the options were constructed.

It only means to make a selection, perhaps for some dependent ui that 
generates desired output. So, the radio button would actually set some 
state or temporary tiddler.

Best wishes, Tobias.

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