"You see there is some sort of auditory response"
Yeah. That's been happening with RTS when you click on units for years now.
"This is something that's quite difficult to do with a mouse."
Yeah. It's real hard to draw that box around a bunch of units... a lot harder than getting both hands on the table. That's for sure.
Nitpicks on his presentation aside, I've been wanting to see something like this for years. Of course, it's always centered around Homeworld on a screen as tall as me, but that's a nice start.