Sometimes the best way to optimize that list of features you are building (or benefits, varieties, solutions etc.) is to diverge with consumers before having them respond to your list.  For example, ask them to share an example of a product feature they wish they had. Then pick any that complement your list and add them to a voting activity where participants can pick the most important among a broader set of solutions.

Tools like Digsite help you do this automatically, so you can determine how early ideas stack-up in consumers’ overall priority list.