Another handy use of ActionSetFieldWidget is to "clone" a tiddler, simply by setting the title field.
Let's suppose you have a Tiddler named "TidA", and you want to make a complete copy of it named "TidB". You can achieve this via:
`<$action-setfield $tiddler="TidA" title="TidB" />`
While this *might* seem like it would rename TidA to TidB, what it actually does is to create a *new* tiddler named TidB with all the same fields and values as TidA, while leaving TidA itself unchanged.
If you actually do want to rename TidA instead of cloning it, you would use the above, followed by:
`<$action-deletetiddler $tiddler="TidA" />`