I would NOT report any specific accounts anywhere, it can lock you into using only those accounts (if you ever have a challenge to your taxes) which you may change from time to time. I've been trading for years and just use separate accounts, some even from the same broker. One is for MTM, three others are non-MTM. I just report them separately on my returns and receive separate 1099's for them. Better to leave your options open but DO NOT use one account for both MTM and non-MTM, that would be the worst thing you could do.
