I could not find any topics that mentioned this feature. I thought I would go ahead and post this.
My suggestion is to have a colour coded bar next your KIAS indicator that give you following info:
GREEN: To tell if it is safe for aircraft to rotate during takeoff roll & safe crusing speed
WHITE: Giving you stall speed
The image below may not be the best example but I just wanted to throw you a rough idea how it will look. It’s pretty much self-explanatory.