Index: app/controllers/search_controller.rb
===================================================================
--- app/controllers/search_controller.rb	(revision 3409)
+++ app/controllers/search_controller.rb	(working copy)
@@ -48,7 +48,7 @@
       return
     end
     
-    @object_types = %w(issues news documents changesets wiki_pages messages projects)
+    @object_types = Redmine::Acts::Searchable.available_search_types
     if projects_to_search.is_a? Project
       # don't search projects
       @object_types.delete('projects')
Index: vendor/plugins/acts_as_searchable/lib/acts_as_searchable.rb
===================================================================
--- vendor/plugins/acts_as_searchable/lib/acts_as_searchable.rb	(revision 3409)
+++ vendor/plugins/acts_as_searchable/lib/acts_as_searchable.rb	(working copy)
@@ -18,6 +18,17 @@
 module Redmine
   module Acts
     module Searchable
+
+      mattr_accessor :available_search_types
+      @@available_search_types = []
+      class << self
+        # Registers a search type
+        def register(search_type)
+          search_type = search_type.to_s
+          @@available_search_types << search_type.pluralize.underscore unless @@available_search_types.include?(search_type)
+        end
+      end
+
       def self.included(base) 
         base.extend ClassMethods
       end 
@@ -52,6 +63,7 @@
           searchable_options[:search_custom_fields] = !reflect_on_association(:custom_values).nil?
           
           send :include, Redmine::Acts::Searchable::InstanceMethods
+          Redmine::Acts::Searchable.register(self)
         end
       end
 
@@ -100,9 +112,11 @@
             find_options[:conditions] = [sql, * (tokens * token_clauses.size).sort]
             
             project_conditions = []
-            project_conditions << (searchable_options[:permission].nil? ? Project.visible_by(User.current) :
+            if searchable_options[:project_key] != ""
+              project_conditions << (searchable_options[:permission].nil? ? Project.visible_by(User.current) :
                                                  Project.allowed_to_condition(User.current, searchable_options[:permission]))
-            project_conditions << "#{searchable_options[:project_key]} IN (#{projects.collect(&:id).join(',')})" unless projects.nil?
+              project_conditions << "#{searchable_options[:project_key]} IN (#{projects.collect(&:id).join(',')})" unless projects.nil?
+            end
             
             results = []
             results_count = 0