For anyone interested, I just submitted a new version of the proc (still awaiting approval from SQL Server Central though...).
Additional output columns added:
Batch_Pct: Percentage of the batch which has been processed
Command_Pct: Percentage of work completed (applicable to a limited set of commands)
Command_Time_Left: Time left before the command completes (DAYS HH:MM:SS)
Command_Completion: Estimated completion time for the command
Deadlock_Priority: Deadlock priority of the session
Isolation_Level: Isolation level of the session
Last_Row_Count: Row count produced by the last statement executed in the batch
Lock_Details: Lock details of the session (in XML format)
Lock_Timeout_Seconds: Lock timeout of the session
Previous_Error: Previous error returned by the session
Hope everyone likes the updates.