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I installed several plugins(buddypress-docs,achievement,bbpress), each one create capabilities for their own post_type. I would prefer to make all roles and capabilities unified into one system, Is there a solution to overwrite all existing caps and control all post_types? Eventually I would like to organize users by group, and assign each user group different caps across all types.

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Some examples would be very helpful. Be specific! :) – toscho Oct 27 '12 at 2:12
just added the plugin names – Jenny Oct 27 '12 at 7:08

Try the Members Plugin. This will allow you to create a new roles (which you can then assign to the groups) with their own cap or mixture thereof.

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for example, in the CPT templates, it normally has conditional tags such as if(bp_docs_user_can($cap)), then, display the content. So, after I use Members or Role-scope, how the CPT templates cope up ? – Jenny Oct 27 '12 at 8:39
justintadlock.com/archives/2010/07/10/… and justintadlock.com/archives/2012/10/16/… should point you in the right direction. – BandonRandon Oct 27 '12 at 9:08
just finished reading the 2 articles,great resource! I tried Members before, it seems to me it doesn't handle the situation where I want to allow certain users to have the cap to edit posts under a category. – Jenny Oct 27 '12 at 9:54

Members plugin will do exactly what you're looking for. I use it in conjuntion with manually adding caps:

// Manipulating a role's capabilities -> http://codex.wordpress.org/Roles_and_Capabilities#edit_posts
function manipulate_role(){
   $role = get_role( 'Master Editor' ); // pick up role to edit

   $role->add_cap( 'edit_users' );
   $role->remove_cap( 'update_core' );         
add_action( 'admin_init', 'manipulate_role');

Maybe it's just me but I found that mapping your own cpt's is the worst idea ever...

Download Map Cap for that instead of coding your "maps". WP has a ways to go with roles and caps and you'll never be able to write code that works as good or better than what Map Cap can accomplish with a few checkboxes.

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