There should be a craft info page like in SP that provides all information of the craft per stage. To make all the information less cluttered, we could have only the general info of the craft being displayed and have detailed information of each stage in drop-down menus.
Also, the Delta V calculator could be enhanced to calculate Delta V of a core and booster combination rocket. (unfortunately my mere coding knowledge does not allow me to make one myself)
Sorry to the team for providing too many suggestions.
Don't be sorry! Thanks for taking the time to provide suggestions. You have some great ideas. We most likely won't be able to do them all, but I appreciate your help.