That is perfectly legal, I'm on cash only restriction with etrade right now, I have made 2 buys and 4 sells in one day with no problem. You can sell as much as you want, it's the buying thats flagged for PDT. Still can't hurt to call though, I'm restricted for a $6 free riding violation, the trade fee put me over, a trade fee they refunded during a free trades promo! Bastards