There is this minor detail in Ubuntu that if I am running two terminals at the same time, and I want to chose one of them using alt-tab I can't instantaneously do it, rather than I have to wait on the terminal icon and then the two terminals will show. Can't I edit this to show all opened tabs of the same program instantly at the major row of the alt-tab?
If you want to switch between two windows of the same application, e.g. Terminal, use Alt + ~. Like in Mac, ~ (tilde) is used to switch windows of same application, and Tab for different applications.
It may not be easy (it wasn't for me) to get used to it, but when you do, you'll find it a lot easier and better.