well any improvement is welcome. I wonder if Relic could comment if they are still working on any other improvements to command delay
We are working on other improvements, but they aren't in a position where they're close enough to talk about.
It's also worth noting that command delay or input lag will always exist in everything to do with human and computer interaction. The goal is to get it to as close to unnoticeable as possible, which obviously we aren't at yet.
How ever until SkyNet wins and we're all machines, there's always going to exist a lag of some kind between human and computers.