I'm not a lawyer, but it seems like your best bet (from a totally manipulative standpoint) is to a) check with your lawyer, and b) lay low on the miles, until she's taken her half of everything else, to the dollar, maybe even a little over. Then, if she asks for the miles, let her know she's already gotten her share of the assets. If she still wants miles, offer to trade the miles for something she really wants to keep and she'll be less likely to make the swap.
Frankly, I'm not sure you did yourself a service in having those miles valued the way you did. I don't know if it could've been done differently, but it makes it hard to find an equitable trade to leverage at such a low valuation.
Either way, you should probably check with your lawyer, LOL.