Widget Entries plugin creates the Widget post-type in the administration area to make easier the edition of the text widgets, and it also register a n
It's possible to add some scripting to your widgets using the shortcodes
[php][/php]. All the text inside those tags will be interpreted as PHP code.
The PHP execution is based in the exceptional plugin Allow PHP in Post and Pages. Have a look to its page for further usage instructions.
Use the shortcodes
[php off][/php]: If you write
[php off]Hola amigo[/php] the widget will display
Widget Entries does not aim to give the inline php execution feature to the posts and pages. To do so I recommend to use Allow PHP in Post and Pages plugin.
If you have created a lot of widget entries I'm sure you are not using them. You can unpublish (save as a draft) the ones that you don't use it anymore, and they will not appear in the select box of the widget.
The capability needed is 'edit_theme_options', the same that is needed to edit sidebar widgets. You can change the capability modifying the 'cap_required' variable at the begining of the plugin source.
You can find further information on the Widget Entries plugin web page