Hi.
I use for more than 14 years the Delphi IDE, and I think Arduino IDE can take some features from this IDE, mainly possibility to have an shortcut to show all functions declared on code. On long development, search every time for functions of code is very difficult and tiring, intellisense is good too, but is not the main need, but show functions will help us a lot.
Check this screen, it help us a lot on faster development.