I am considering selling a mutual fund in a Roth account that I have had for less than a year. Since Roth and traditional IRA accounts are tax sheltered and capital gains only apply when distribution occurs when retirement, should I be worrying about selling the fund before keeping it 1 year for any reason except transaction fees incurred when the fund was bought?
No. Can't understand why would you even think about it. The only thing to consider is the early sales fee, if its a NTF fund. Capital gains in the IRA/401k accounts are not taxed at all, so there's no difference whether you hold it more than a year or not.