Arduino IDE features which I think should be present

I am a Arduino User. I had experience in working with many other IDE's like Keil, CCS, IAR.
There are few changes I like to suggest:

1. GUI interface for Optimization Flag: Add a small GUI interface in preference section for optimization flag settings.

2. Option to add multiple .c & .h in workspace tree. Files added should appear on project workspace tree on left side. Write know you can also add multiple files but there is no proper project workspace tree like section.

3. Display ZI, RW,...

Arduino IDE features which I think should be present