GridPlus Mass Update

We have a need to updater pricing on our inventory items.  I was thinking about using a GridPlus grid over an Editable Grid for the increase in performance.  My question is, is there a way using a GridPlus grid to allow the user to increase the selected items by a certain percentage?  Example would be that they could select 20 different items, enter 3 in a filed for 3% and maybe click a button and all 20 items increase by 3%?  Any input or thoughts would be greatly appreciated.