If I stationed my units somewhere, I want them there. I don't want them wandering about. They were placed there for a reason. There could, and should be animations for idle units but on the spot animations, not wandering about. Whether they sit, stand or sleep doesn't matter to me, but I don't want units wandering about. Frankly, that's not even an RTS to me. The 'S' is being taken out. Real-time indeed.
What would be more beneficial towards the realism of the game, without detracting from the RTS element, is to have adequate start, stop and turning animations for all units.