Robert
The done button is found in $:/core/ui/Buttons/save also known as OK.
The actions used are found in the macro `<<save-tiddler-actions>>`
but you could edit and add more actions in that button.
Alternatively the tiddler $:/core/ui/EditTemplate
Is where save-tiddler-actions is defined, you can add some actions there.
Of course you could clone, then modify the
$:/core/ui/EditTemplate and change the edit template tiddlername used in $:/config/ui/EditTemplate
Regards
Tones