I saw it mentioned in reference to updating new libraries that it would be a good idea to possibly highlight the cells that you updated with new formulas etc.  Taking it one step further I think it would be great if we had the ability to highlight cells in edit design data spreadsheets without having to open workbook explorer. 

There are times when 1 or 2 quick little tweaks are easier to make in edit design data spreadsheets than going through the product prompts.  Especially when adjusting a formula or adding additional parts etc.  It would be nice if while doing that we could quickly highlight cells if we need or want to just as a refence for future review or to understand changes that were made.