Pruning - doubtful. Trimming - definitely. Topping - My ceiling is only eight foot tall and the plants will be at least 12" off the floor. Add in about 2' for the distance between the lights and plants, so they cannot grow much more than 4' tall.
I know the Florida 91 and the OT 06 313 plants can grow tall but I figure I can let them droop once they get to the 4' level.
For better or worse, I do want to document the grow. But, as I keep telling myself, this is an experiment. By 2013 I want to be doing this for a living so I am willing to suffer a failure if it means I learn how to do things better - be it the variety or the method!
My tallest tomato plant so far is 6feet tall now. Not a lot of branching out. Topped it off and it has started branching out again. Will prune it again in the future.