Now here's my opinion.
Adhere to the K.I.S.S. rule.
Please make rep Bind-to-Account.
We do not know for how long that Blizzard intends to keep World of Warcraft going.
They are an international entertainment business after all, and no doubt, our beloved, faithful, adventerous characters are living on borrowed time.
I get to play more than my wife does, however she enjoys the game even more than I.
Especially crafting, cooking, etc. and it really thrilled her when the mounts were made available to alll of her "babies".
She really does work 16-20 hour days, at least four days out of every week and it's difficult for her to play the amount of time needed to grind it out for multiple toons.
It isn't that big of a deal and would hurt no one.