Help with modules

[Herb Hrowal <hhrowal@gmail.com>]

I'm new to OpenLDAP and have some questions on "plug-ins".

Is there any plug-in api other than the backend support?

Is it possible for a backend to modify a request before it is sent to
other backend modules?

Is there any way to insert a shim between the frontend and the various
backends we use other than to modify OpenLDAP.

If a shim is possible, can it specify which backend handles the request?

Is there any good documentation on writing backends?

Any help would be greatly appreciated.

Herb