What it is now, is what it will be.
"Take Cover"
is a section order and a standard battle drill. (Upon receipt of the words of command “Take Cover!”: 'Dash', 'Down', 'Crawl', 'Observe', 'Sights', 'Return Fire'.)
file:///I:/DOCUME~1/admin/LOCALS~1/T...emy%20Fire.pdf
There
wont be a "you successfully took cover from 23 enemy units" message. You
only know if your action was successful by the enemy response to it, as in real life.
You are completely free to press the "C" key as you wish as long as you have the required free MP, as each successive take cover action may well work, whereas previous attempts did not.
Andy