Really? It's been so long since I last played any of them. Perhaps I was just too dumb at the time to figure that out. That could've saved me a lot of unnecessary annoyance...
I vote for no audio when selecting / giving orders. It's ****ing annoying, cheesy, unrealistic, and adds nothing whatsoever to the game.
For what it's worth, selection sounds could be turned on/off in the Infinity Engine games.
I'm thinking Obsidian will implement an option for this too.
I still think it's a waste of time and resources even including that kind of thing in the game though.