>> +Maintenance Mode Configuration
>> +==============================
>> +
>> + ... Please keep in mind that users who are already logged-in
> 
> Did you try that? I think it causes every request to redirect to the
> maintenance page, same for ajax requests. Basically users who use
> owncloud while maintenance mode is active will cause requests to fail.
> 
> Heres the code snippet that gets executed before each request btw:

Thank you for pointing this out. Sometimes it is worse to run a test ;-)
I've changed the description accordingly.