Grid creation tool should poll data frame size

Idea created by clm42 on Aug 16, 2012
    When making a grid for a DDP map using "Use Page Unit and Scale" allows you to easily conform your grid to the aspect ratio of your dataframe. When you check that box however it defaults the polygon width and height to 1 inches. Can we have it default to the width and height of the active dataframe? This would save going into the datafram properties writing down the size and then typing it into the tool inputs.