I believe the stage is set for smaller cameos, was set after the openers got a 75 run stand at almost 4 an over, but is certainly set now. Uncontrol the aggression, even a good 20 minutes (ie 20 deliveries total, 12 to Dhoni and 25-30 runs from that) is OK.Again, if you want him to score runs for more than twenty minutes, e.g, controlled aggression towards a defensive field - I'd still have Dravid or Tendulkar.
Would be disappointing for Dhoni to not come out blazing tomrrow morning (perhaps an over or two to settle down). Then with 50 more in as quick a time as possible declare, if Dhoni falls just a little short, perhaps even consider Zaheer or Harbhajan.
If Dhoni, Ganguly fall a lot short - then send Dravid, Tendulkar to add another 250-300 and wear out the bowlers. In that scenario hope Laxman gets to extend his strong of 4 notouts, wonder what is the record for that.
In terms of series : India & Pakistan have to remember that Bangalore is the venue for 3rd test, possibly one of the weakest for the home team. A win here is not just ornamental, but possibly key to the series win by either side.