There should never be a need to add additional real weight unless you need to for trim.
The procedures for increased V2 procedure, allow you to use a higher sped on the ground to give better climb performance margin in the event of a loss of one engine. All in the Perf A exam which I last took 11 years ago. My brain ain't that good!
My little Dash jumps into the air usually in the touchdown zone on most runways, so I don't think about such things much anymore....