Not much on this topic in the help file when you search for Batch.

1. Can this feature be disabled from worklist?

2. Can this feature be disabled for specific processes (due to corporate policy)?

3. What happens when the selected task items have different actions?

 Batch processing allows a user to process multiple task items at once. Selecting the check box permits the task item to be processed in batch. Clicking the Batch Action: down arrow displays the actions available for batch processing such as Approved or Declined. The task items must be selected to be included in the batch. Checking the check box in column heading will automatically select all task items for batch processing.

1.  No, not as of release 803.

2.  It can be disabled individually for each action in a client event simply by un-checking the box in the wizard labled "Make the action available without opening the work item."  

3.  If you select multiple work items, only those actions common to all of them will be available in the batch action.

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