Ability to have fields in Improvements Module that allows you to complete on closure

In the Improvements module you are able to make fields mandatory on reporting or assigning. It would be great to have fields that are mandatory to be completed at close out. We have certain fields that would be great for monitoring purposes for example if our customer complaints were substantiated or not this field needs to be completed at close out and also a final cost for the improvement or customer complaint needs to be completed at the final close out. So if there is a prompt prior to close out that ensures it has been filled in prior to close out the improvement.