Inconsistency in callback processing

Hello,

In the hook_cron_queue_info there is the 'worker callback' property. As it points out it should get a callback:
Valid callbacks in PHP:
'function_name'
array('class_name', 'static_method_name')
array($instance, 'instance_method_name')
function(...) use (...){...}

Even if we discard the last one as it is introduced in PHP from 5.3, the rest 3 are valid callbacks in 5.2.
As it is implemented currently it will accept only the first one - function_name.
The same is also in the management of batch 'finish' callback and probably other callbacks handling functions.

Is there good reason for the current state of the code?
Upload initial patch to target the problems shortly.