New addon: Default Features - allow admin to turn some Additional Features on by default for new users.

defaultfeatures/README

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+Default Features Plugin
+
+This plugin allows the site admin to choose which Additional Features
+ are on by default for newly created users on the site. The defaults 
+ apply to all new users upon registration, but do not impact a user's
+ ability to turn features on/off once their account has been created.
+These default settings do not impact existing users.

defaultfeatures/defaultfeatures.php

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+<?php
+/**
+ * Name: Default Features
+ * Description: Choose which Additional Features are on by default for new users on the site.
+ * Version: 1.0
+ * Author: Michael Johnston
+ */
+
+function defaultfeatures_install() {
+    register_hook('register_account', 'addon/defaultfeatures/defaultfeatures.php', 'defaultfeatures_register');
+    logger("installed defaultfeatures plugin");
+}
+
+function defaultfeatures_uninstall() {
+    unregister_hook('register_account', 'addon/defaultfeatures/defaultfeatures.php', 'defaultfeatures_register');
+    logger("uninstalled defaultfeatures plugin");
+}
+
+function defaultfeatures_register($a, $newuid) {
+    $arr = array();
+    $features = get_features();
+    foreach($features as $fname => $fdata) {
+	    foreach(array_slice($fdata,1) as $f) {
+                    set_pconfig($newuid,'feature',$f[0],((intval(get_config('defaultfeatures',$f[0]))) ? "1" : "0"));
+	    }
+    }
+}
+
+function defaultfeatures_plugin_admin_post (&$a) {
+    check_form_security_token_redirectOnErr('/admin/plugins/defaultfeatures', 'admin_themes');
+    foreach($_POST as $k => $v) {
+	    if(strpos($k,'feature_') === 0) {
+	            set_config('defaultfeatures',substr($k,8),((intval($v)) ? 1 : 0));
+	    }
+    }
+    info( t('Features updated') . EOL);
+}
+
+function defaultfeatures_plugin_admin (&$a, &$o) {
+    $t = get_markup_template( "admin.tpl", "addon/defaultfeatures/" );
+    $arr = array();
+    $features = get_features();
+    foreach($features as $fname => $fdata) {
+	    $arr[$fname] = array();
+	    $arr[$fname][0] = $fdata[0];
+	    foreach(array_slice($fdata,1) as $f) {
+		    $arr[$fname][1][] = array('feature_' .$f[0],$f[1],((intval(get_config('defaultfeatures',$f[0]))) ? "1" : "0"),$f[2],array(t('Off'),t('On')));
+	    }
+    }
+
+    //logger("Features: " . print_r($arr,true));
+
+    $o = replace_macros($t, array(
+        '$submit' => t('Submit'),
+        '$features' => $arr
+    ));
+}

defaultfeatures/view/admin.tpl

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+<input type='hidden' name='form_security_token' value='$form_security_token'>
+{{ for $features as $f }}
+<h3 class="settings-heading">$f.0</h3>
+
+{{ for $f.1 as $fcat }}
+	{{ inc field_yesno.tpl with $field=$fcat }}{{endinc}}
+{{ endfor }}
+{{ endfor }}
+<div class="submit"><input type="submit" name="defaultfeatures-submit" value="$submit" /></div>

defaultfeatures/view/smarty3/admin.tpl

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+{{*
+ *	AUTOMATICALLY GENERATED TEMPLATE
+ *	DO NOT EDIT THIS FILE, CHANGES WILL BE OVERWRITTEN
+ *
+ *}}
+<input type='hidden' name='form_security_token' value='{{$form_security_token}}'>
+{{foreach $features as $f}}
+<h3 class="settings-heading">{{$f.0}}</h3>
+
+{{foreach $f.1 as $fcat}}
+	{{include file="field_yesno.tpl" field=$fcat}}
+{{/foreach}}
+{{/foreach}}
+<div class="submit"><input type="submit" name="defaultfeatures-submit" value="{{$submit}}" /></div>