Really resolved, this time.

Kronolith 4.2.2

Changes have been made in Git (FRAMEWORK_5_2):

commit a8e7e1b3a54d1ddd55f0f787dd3db0571e2e7589
Author: Michael J Rubinsky <mrubinsk@horde.org>
Date:   Fri Aug 29 12:45:55 2014 -0400

     Bug: 13049 Honor resource_management perms.

  kronolith/lib/Ajax/Application/Handler.php |    3 ++-
  kronolith/lib/Resource/Base.php            |    3 ++-
  2 files changed, 4 insertions(+), 2 deletions(-)

http://github.com/horde/horde/commit/a8e7e1b3a54d1ddd55f0f787dd3db0571e2e7589

Changes have been made in Git (master):

commit ccbd210f83d049ec71d8b83f893ba3ab8bed39ce
Author: Michael J Rubinsky <mrubinsk@horde.org>
Date:   Fri Aug 29 12:45:55 2014 -0400

     Bug: 13049 Honor resource_management perms.

  kronolith/lib/Ajax/Application/Handler.php |    3 ++-
  kronolith/lib/Resource/Base.php            |    3 ++-
  2 files changed, 4 insertions(+), 2 deletions(-)

http://github.com/horde/horde/commit/ccbd210f83d049ec71d8b83f893ba3ab8bed39ce

The problem is with non-admin users which have the resource management 
right assigned. They see the "+" sign and can type in data for a new 
resource, but can not save/create the resource.

Did you try as non-admin with resource mgmt rights?

Cannot reproduce. I don't see the icon as non-admin user.

Still buggy in current git master, non-admin users see the "+" Icon, 
but get "You are not allowed to create new resources."

This patch should fix it:

diff --git a/kronolith/lib/Ajax/Application/Handler.php 
b/kronolith/lib/Ajax/Application/Handler.php
index 76fe5da..a400b79 100644
--- a/kronolith/lib/Ajax/Application/Handler.php
+++ b/kronolith/lib/Ajax/Application/Handler.php
@@ -1046,7 +1046,7 @@ class Kronolith_Ajax_Application_Handler extends 
Horde_Core_Ajax_Application_Han
              if (!$calendar_id) {
                  // New resource
                  // @TODO: Groups.
-                if (!$GLOBALS['registry']->isAdmin()) {
+                if (!$GLOBALS['registry']->isAdmin() && 
!$GLOBALS['injector']->getInstance('Horde_Core_Perms')->hasAppPermission('resource_management')) 
{
                      $GLOBALS['notification']->push(_("You are not 
allowed to create new resources."), 'horde.error');
                      return $result;
                  }

Kronolith 4.2

Changes have been made in Git (master):

commit afb578fe149a9a67f8dfdae6156968f92386f6ca
Author: Michael J Rubinsky <mrubinsk@horde.org>
Date:   Wed Apr 2 14:56:32 2014 -0400

     Request: 13049 Add permission for resource_management.

  kronolith/lib/Application.php                |   98 +++++++++++++------------
  kronolith/lib/Driver/Resource/Sql.php        |   13 +++-
  kronolith/lib/View/Sidebar.php               |    2 +-
  kronolith/templates/dynamic/sidebar.html.php |    4 +-
  4 files changed, 65 insertions(+), 52 deletions(-)

http://github.com/horde/horde/commit/afb578fe149a9a67f8dfdae6156968f92386f6ca

i want to give a user (secretary) the permission to create ressources 
but i didn't find a way to achieve that without making this user to 
the admin of horde. permission dialog doesn't show a permission that 
can be selected and/or enabled for this task.