Hi @nakedmind,
when a tiddler has a field, you can focus it and press ctrl-alt-d and it gets deleted.
these actions are in the tiddler $:/core/macros/tag-picker
if you want to do the same with an external keyboard shortcut (a tiddler tagged with $:/tags/KeyboardShortcut) then you would have to know the field you want to delete. Anyway, if you want to do that, you'd do it like this:
<$fieldmangler tiddler={{$:/temp/current-tiddler}}>
<$action-sendmessage $message="tm-remove-field" $param="my-field"/>
</$fieldmangler>
or
<$action-deletefield $tiddler={{$:/temp/current-tiddler}} $field="my-field"/>
... but these two examples would work only with the specified field and that's a bit cumbersome
I'd prefer the <$keyboard> widget solution. Look at the bottom of $:/core/macros/tag-picker