Dave Penney's Darlington side dominated the second half with Keltie coming close to scoring when he hit the post, before Perkins conjured a dramatic equaliser out of nothing.
Names linked with the vacancy include former Southend boss Steve Tilson, ex-Darlington and Doncaster boss DavePenney and former Imps manager Steve Thompson, who first took charge of the club 20 years ago.
O'Driscoll replaced DavePenney in September, while McCammon wrote his name into Rovers folklore by becoming the first player to score at the new Keepmoat Stadium on New Year's Day following their move from Belle Vue.