How can I set values in the $conf array using the admin interface? I am using the Journal  module and in order to limit the forms its text box appears on the form ids have to go into a $conf variable. The docs say it has to go into settings.php but I don't watch that.

$conf['journal_form_ids'] = array(
    'fivestar_custom_widget' =&gt; 0,
    'guestbook_form_entry_form' =&gt; 0,
    'imagefield_js' =&gt; 0,
    'img_assist_header_form' =&gt; 0,
    'img_assist_properties_form' =&gt; 0,
    'link_widget_js' =&gt; 0,
    ...
);


Is there a module that can accomplish this from the admin interface?
Can it be done through some kind of execute PHP form like with devel?

It has to be done from the admin
Sure, you can do this at devel/php if Devel module is enabled and you have access to Devel module's Execute PHP code.

The PHP to do what you want is

variable_set('journal_form_ids', array(
    'fivestar_custom_widget' =&gt; 0,
    'guestbook_form_entry_form' =&gt; 0,
    'imagefield_js' =&gt; 0,
    'img_assist_header_form' =&gt; 0,
    'img_assist_properties_form' =&gt; 0,
    'link_widget_js' =&gt; 0,
    // ...
  ));