http://www.fudzilla.com/home/item/26127-origin-auto-adding-steam-purchased-ea-titles i can personally confirm this - started up origin today to find medal of honor was on it - and i bought that in the steam sale.
Also if you use a retail version of a game whilst you own a digital version it will add it will work. I used an old none origin version of Shift 2 Unleashed to install the game which i bought via Origin
Yep I've had this happen to me with Dead Space 2, but not BC2, ME, or ME2 which I all have on steam. If I try to run Dead Space 2 on origin however, it essentially runs the steam game. Not great considering everytime I've tried running steam and origin together my PC bsod.
maybe impulse and steam should do the same? I know origin can do it 'cause its only ea titles, but still! Would be awesome
Steam ahs no real incentive to do it, all it would do is cost them server capacity. With Origin being largely unestablished, this is a pretty smart way for EA to encourage its use.
Yeh I noticed this as well with C&C4 - but not with the other EA games I've purchased through steam, such as BF:BC2. Let's be fair though, I'm never likely to play C&C4 EVER again, steam or otherwise. Terrible game.