Had this idea a few days ago, having just seen the bonus character skins for BETA players which is nice. My idea was for us to be able to carry one item through the reset. I'm sure everyone has that favourite item in their collection that they'd love not to have to get lucky to find again I don't see that it would be anything other than a possible minor advantage in terms of MP, but would certainly mean a lot to me in SP, which is my main interest until co-op comes around.
Minor advantage in mp doesn't even come close so definitely no. Whats worse is its probably hard to implement a solution for picking a item to save while the whole account is wiped clean.
Not being a MP myself could you elaborate on why letting us take one item would imbalance MP so much?
Powerful items do a lot early on before people have the chance to have the gear to counter it. For example the first person with encumber is going to be at a heavy advantage before people start getting team moves. So if i where to keep a item for the sake of power gaming not sentimentality i would most certainly pick on of the frost bolt or freeze staves for wizard.